13 best quiet inline fans

Product description

Inline Duct Fan

The duct fan system is designed to quietly cool AV equipment rooms and closets, and to ventilate various air circulation and exhaust projects. Features an inline speed controller utilizing PWM-technology. Contains a mixed-flow design and an EC-motor for a quiet and high static-pressure performance. The motor box containing the fan’s impeller and blades can be detached from the mounted frame for easy cleaning and maintenance. Complete kit includes one duct fan unit, one inline speed controller, installation manual, and all necessary mounting hardware.

Precise Speed Controller

The inline speed controller enables you to set the duct fan’s speed to optimal noise and airflow levels for various environments. Unlike common AC-powered duct fans that suppresses voltage to control fan speeds, this duct fan features an EC-motor that is precisely controlled using PWM (Pulse Width Modulation). This technology enables the fan's motor to be able to run smoothly at extremely low RPM speeds without generating motor noises and heat as seen on variable voltage controllers. Eight-speed options are available with a power switch, and backup memory. This S6 model can be connected to the smart controller of the CLOUDLINE T6 (AI-CLT6) model to share the same programming and power source.

Quiet and Energy Efficient Design

The inline booster fan features a mixed flow design using a stator blade and dual hydrodynamic wind circles. This gives it a high static pressure rating, enabling it to deliver airflow even in applications where air movement is being restricted. The motor houses dual ball bearings rated at 67,000 hours which allows the duct fan unit to be mounted in any direction. The unit is IP44 rated to be highly resistant to dust and liquids and performs well even in harsh environments.

• Designed to ventilate grow tents, transfer heating/cooling to rooms, circulate air, exhaust odors, and cool AV racks.
• Features an 8-speed manual controller utilizing PWM. See T-Series for temperature and humidity controls.
• Mixed flow design combined with an EC-powered motor for a truly quiet and energy efficient performance.
• Kit also includes corded AC power adapter, installation manual, and all necessary mounting hardware.
• Duct Size: 6” | Dimensions: 7.9 x 12.6 x 8.4 in. | Airflow: 402 CFM | Noise: 32 dBA | Bearings: Dual Ball

User questions & answers

Question:	how much static pressure can this produce? can it push a couple hundred cfm thru 6 inch duct for 40ft
Answer:	Hello, Thank you for your inquiry. I would recommend using compressed air to clean the unit from the vents. This unit produces 300 Pa of static pressure with a highest CFM rating of 351. That being said, it will initially push a couple of CFM in the beginning but the further it goes the less CFM it will push. Kind Regards,
Question:	Does the fan come with a pressure switch
Answer:	Hi there, Thank you for reaching out to us! The fan only comes with a speed controller that will allow you to adjust the speed of the fan, there is no pressure switch. Kind regards, Kenny Ngo AC Infinity
Question:	Is the impeller on fan made of plastic or metal
Answer:	Hi there, Thank you for reaching out to us! The blades on this fan would be made of plastic. Kind regards, Kenny Ngo AC Infinity
Question:	What is the range of cfm output, at different settings? can i bring it down as low as 100 cfm
Answer:	Hi there, Thank you for reaching out to us! Below I have provided an approximate breakdown of the CFM for the fan on each different speed. 44 / 88 / 132 / 176 / 220 / 264 / 308 / 351 Kind regards, Kenny Ngo AC Infinity

Product features

A Quieter and Smarter Inline Fan

The new CLOUDLINE series contains a cutting-edge Electronically Commutated (EC) motor, controlled using precise electronic pulses and smart programming. This enables the inline fan to operate considerably quieter, and reach low speeds without generating noise or heat. The EC motor is also twice as energy efficient and can save up to 40% in energy costs, paying for itself in the long run.

Smart Programming

T-series models include a programmable controller with precise temperature and humidity sensors located on the 12-foot corded probe.

Quiet PWM Motor

Each fan uses a quiet, energy-efficient EC motor controlled using Pulse Width Modulation (PWM). Dual ball bearings allow for omnidirectional mounting.

Mixed-Flow Design

Featuring a mixed flow design, the fans maintain peak performance in high static pressure environments. Ingress-protected against dust and liquids.

Plug and Play

The complete kit includes the inline fan unit, controller, user manual, and everything needed to mount the fan and power it through an outlet.

CLOUDLINE 4-Series

A CLOUDLINE T4 plus CLOUDLINE S4 system can be linked to the same smart controller, and used in conjunction for a total of 410 CFM airflow. This set-up is ideal for ventilating smaller grow tents and cooling AV rack cabinets.

CLOUDLINE 6-Series

A CLOUDLINE T6 plus CLOUDLINE S6 system can be linked to the same smart controller, and used in conjunction for a total of 804 CFM airflow. This set-up is ideal for large grow tents, AV closet cooling, and boosting airflow for HVAC projects.

MIX and MATCH

The same controller can connect CLOUDLINE fans of different sizes, to share the same programming. For example, an exhausting CLOUDLINE T6 with a filter can share the same controller as an intaking CLOUDLINE S4, to balance static pressure.

Product description

Inline Duct Fan

A smart inline duct fan designed to quietly ventilate hydroponic grow rooms, boost heating/cooling to rooms, circulate fresh air, exhaust projects, and cool AV closets. Featuring an inline mixed-flow design, the duct fan can maintain airflow even in high static pressure applications. Contains an EC-motor with PWM-control for a quiet and energy-efficient performance. Includes an intelligent controller that features advanced programming and functions. Complete kit includes one duct fan unit, one thermal controller, one corded thermal probe, two duct clamps, installation manual, all necessary mounting hardware, and all necessary mounting hardware.

Intelligent Controller

The controller can be programmed to adjust fan speeds to respond to varying high and low temperatures, and humidity. For ventilation applications, the controller can be set to run continuously or triggered to run at customizable speeds when given power, due to its backup memory capability. Additional features include a countdown timer, alarm system, and eco-mode. Includes a detachable 12-foot precision probe that is water-resistant. This EC smart controller can power and control two inline fans of any size like this CLOUDLINE T6 with an S4.

Quiet and Energy Efficient Design

Features an EC-motor that is controlled using PWM (Pulse Width Modulation). This technology enables motors to be able to run smoothly at extremely low RPM speeds without generating additional heat or noise. In addition, the duct fan uses a mixed-flow design using a stator blade and dual hydrodynamic wind circles. This gives it a high static pressure rating, enabling it to deliver airflow even in applications where air movement is being restricted. The motor houses dual ball bearings rated at 67,000 hours which allows the duct fan unit to be mounted in any direction. The unit is IP44 rated to be highly resistant to dust and liquids, and performs well even in harsh environments.

• Designed to ventilate hydroponic grow rooms, transfer heating/cooling, cool AV closets, and exhaust odors.
• Intelligent controller with temperature and humidity programming, fan speed control, timer, and alarm system.
• Mixed flow design combined with a PWM-controlled EC-motor for a truly quiet and energy efficient performance.
• Kit also includes corded sensor probe, AC power plug, two duct clamps, and required mounting hardware.
• Duct Size: 6” | Dimensions: 7.9 x 12.6 x 8.4 in. | Airflow: 402 CFM | Noise: 32 dBA | Bearings: Dual Ball

User questions & answers

Question:	Where is the humidity sensor? Is it on the sensor probe that also does temp
Answer:	Hello, Thank you for taking the time to reach out to us. Yes, the humidity sensor detector will be on the same cord as the temperature probe. Kind regards, AC Infinity
Question:	When unplugged and plugged back in will it return to the same speed as before? I want to add a switch to the outlet
Answer:	I just tried it because of your question, yes it does, but I think you're asking about a timer situation, I would say that you shouldn't bother with a timer, the reason to get this fan over others is the programmability, this thing self adjusts its own speed based on the high/low temp and the high/low humidity that you enter, the power used to run it is very small.
Question:	Humidity and temperature way off does anybody else have this problem? Can it be fixed
Answer:	If all of you that have problems with these would read the instructions you can calibrate both temp and humidity as well as fix any problem with your fan not working it’s probably not turned on or is in the wrong setting check the instructions before blaming the unit these things are great in my opinion
Question:	What are the cfm rating on it
Answer:	Hello there! Thank you you for taking the time to reach out to us with your product question! The CFM rating for the CLOUDLINE T6 is 351 CFM. Also, for your reference, I have included all technical data associated with the T6 (please see below): Product Identification Manufacturer AC Infinity Inc. Product Name CLOUDLINE T6 Product Model AI-CLT6 UPC Code 854759004792 Product and Mounting Dimensions - Fan Unit Total Dimensions 7.87 x 12.60 x 8.35 in. (21.2 x 32.0 x 20.0 cm) Mounting Hole-To-Hole Distance 3.15 X 2.36 in. (8.0 x 6.0 cm) Screw Hole Size Ø 0.236 in. (Ø 0.6 cm) Cord Length 144 in. (12 feet) Product and Mounting Dimensions - Controller Total Dimensions 5.20 x 3.11 x 1.10 in. (13.2 x 7.9 x 2.8 cm) Backside Enclosure Dimensions 4.41 x 2.68 in. (11.2 x 6.8 cm) Required Mounting Hole 4.48 x 2.76 in. (11.4 x 7.0 cm) Hole to Hole Distance 4.71 x 2.64 in. (12.0 x 6.7 cm) Screw Hole Size Ø 0.157 in. (Ø 0.4 cm) Display Size 2.25 x 1.25 in. (4.7 x 3.2 cm) Cord Length 72 in. (6 feet) Thermal Probe Length 72 in. (6 feet) Mounting Template Installation Manual PDF Product Performance and Technical Specs Total Airflow 351 CFM Total Noise 32 dBA Static Pressure 300 Pa Operating Voltage 24V DC Power 40 W Current 1.67 A Wall Adapter Input 100 to 240V AC Operating Humidity 35 to 85% RH Operating Temperature 14 to 230°F Ingress Protection IP 44 Fan Bearings Dual Ball L10 Life Expectency 67,000 Hours Fan Quality Approvals UL, CE, TUV, RoHS Thank you for your question! Kind regards, Andrew Avila AC Infinity

Product features

A Quieter and Smarter Inline Fan

The new CLOUDLINE series contains a cutting-edge Electronically Commutated (EC) motor, controlled using precise electronic pulses and smart programming. This enables the inline fan to operate considerably quieter, and reach low speeds without generating noise or heat. The EC motor is also twice as energy efficient and can save up to 40% in energy costs, paying for itself in the long run.

Smart Programming

T-series models include a programmable controller with precise temperature and humidity sensors located on the 12-foot corded probe.

Quiet PWM Motor

Each fan uses a quiet, energy-efficient EC motor controlled using Pulse Width Modulation (PWM). Dual ball bearings allow for omnidirectional mounting.

Mixed-Flow Design

Featuring a mixed flow design, the fans maintain peak performance in high static pressure environments. Ingress-protected against dust and liquids.

Plug and Play

The complete kit includes the inline fan unit, controller, user manual, and everything needed to mount the fan and power it through an outlet.

CLOUDLINE 4-Series

A CLOUDLINE T4 plus CLOUDLINE S4 system can be linked to the same smart controller, and used in conjunction for a total of 410 CFM airflow. This set-up is ideal for ventilating smaller grow tents and cooling AV rack cabinets.

CLOUDLINE 6-Series

A CLOUDLINE T6 plus CLOUDLINE S6 system can be linked to the same smart controller, and used in conjunction for a total of 804 CFM airflow. This set-up is ideal for large grow tents, AV closet cooling, and boosting airflow for HVAC projects.

MIX and MATCH

The same controller can connect CLOUDLINE fans of different sizes, to share the same programming. For example, an exhausting CLOUDLINE T6 with a filter can share the same controller as an intaking CLOUDLINE S4, to balance static pressure.

• Designed to ventilate grow tents, transfer heating/cooling to rooms, circulate air, exhaust odors, and cool AV racks.
• Features an 8-speed manual controller utilizing PWM. See T-Series for temperature and humidity controls.
• Mixed flow design combined with an EC-powered motor for a truly quiet and energy efficient performance.
• Kit also includes corded AC power adapter, installation manual, and all necessary mounting hardware.
• Duct Size: 4” | Dimensions: 6.9 x 11.9 x 7.4 in. | Airflow: 205 CFM | Noise: 28 dBA | Bearings: Dual Ball

User questions & answers

Question:	If powered from a switched outlet, will it remember the last speed setting or does that require constant power
Answer:	Morning RS, the S4 will not remember your fan speed. It’s a manual setting only. I also have a T4 with a smart controller and it does remember and can be set to auto for heat and humidity. The T4 is for auto exhaust and S4 is intake. If it is your only fan go with the T4. Also, if you have more than 200sf to ventilate go directly to the T6. The are very quiet which is important as my room is under a bedroom. Hope this helps.
Question:	What is the max temp of use for this fan? i see you said 240f, but all other manufacturers with plastic impellers say max temp 140f. are you certain
Answer:	Hello, The Maximum rating for that fan unit is 230 degree Fahrenheit. This is what the fans materials are rated for. Thank you for your question! Kind regards, Andrew Avila AC Infinity
Question:	What is the best way to connect this to 12 or 24 volt system
Answer:	Hi there, Thank you for reaching out to us! I'm sorry but this product would need to be plugged directly into an AC outlet to power on or you can also connect the fan to an existing digital thermal controller from the CLOUDLINE T4 model. We do not recommend hardwiring any of our products as it would deem the product out of warranty and will likely cause damage. Kind regards, Kenny Ngo AC Infinity
Question:	How well does this work with a carbon filter
Answer:	I have a 350 Cfm Coco/Carbon Fiber filter that I place on the Exit side of my application. I have tested the filter on both the intake and the exit. I found these units Push much better than they Pull. I do have to increase the power by 10% when I install the exit filter, but it's not really an issue in my application.

Product features

A Quieter and Smarter Inline Fan

The new CLOUDLINE series contains a cutting-edge Electronically Commutated (EC) motor, controlled using precise electronic pulses and smart programming. This enables the inline fan to operate considerably quieter and reach low speeds without generating noise or heat. The EC motor is also twice as energy-efficient and can save up to 40% in energy costs, paying for itself in the long run.

Smart Programming

T-series models include a programmable controller with precise temperature and humidity sensors located on the 12-foot corded probe.

Quiet PWM Motor

Each fan uses a quiet, energy-efficient EC motor controlled using Pulse Width Modulation (PWM). Dual ball bearings allow for omnidirectional mounting.

Mixed-Flow Design

Featuring a mixed flow design, the fans maintain peak performance in high static pressure environments. Ingress-protected against dust and liquids.

Plug and Play

The complete kit includes the inline fan unit, controller, user manual, and everything needed to mount the fan and power it through an outlet.

CLOUDLINE 4-Series

A CLOUDLINE T4 plus CLOUDLINE S4 system can be linked to the same smart controller, and used in conjunction for a total of 410 CFM airflow. This set-up is ideal for ventilating smaller grow tents and cooling AV rack cabinets.

CLOUDLINE 6-Series

A CLOUDLINE T6 plus CLOUDLINE S6 system can be linked to the same smart controller, and used in conjunction for a total of 804 CFM airflow. This set-up is ideal for large grow tents, AV closet cooling, and boosting airflow for HVAC projects.

MIX and MATCH

The same controller can connect CLOUDLINE fans of different sizes, to share the same programming. For example, an exhausting CLOUDLINE T6 with a filter can share the same controller as an intaking CLOUDLINE S4, to balance static pressure.

• A duct fan designed to increase airflow in HVAC systems and ventilate home spaces like attics and workshops.
• Features a variable fan speed controller, enabling you to optimize airflow and noise level for any application.
• Unibody die-cast construction with no welded seams; reduces vibration while ensuring smoother airflow.
• AC brushless motor with steel blades and lubricated bearings; not suitable in restricted airflow applications.
• Duct size: 6” | Dimensions: 7.28 x 5.90 x 5.90 in. | Airflow: 265 CFM | Noise: 35 dBA | Bearings: Dual Ball

User questions & answers

Question:	Where can I get a aviation port cord exatention
Answer:	Hello, Thank you for taking the time to reach out to us! Unfortunately, the RAXIAL S6 does not have an extension cord. Please accept our sincerest apology! Thank you for your question! Kind regards, The AC Infinity Team-
Question:	At how high of temps can this fan function or do you recommend another product? Does it have thermal protection
Answer:	I am currently using a 2x2x4 grow tent with 2 "600" watt LED lights that I run from 7pm to 10am and as long as I barely turn the speed controller up a 1/4 turn when lights come on it's about 80 degrees on my therm under the light. Then when the lights go off I just turn down to low and it's perfectly fine gets down to 70 degrees if that's what your house is at. I do HVAC and I was totally blown away with the power, the constructions of material , it's a high quality product I was already thinking of using for customers not getting enough air to bath room or far away room ect.
Question:	Is it possible to Daisy chain this fan to the cloudline T
Answer:	I sort of daisy chained a s4 booster for intake with a T6. I used a 3 grounded outlet adapter to plug both into the temp controller. Works for me.
Question:	Will this plug into T8 digital temp and humidity control
Answer:	Hello there, Thank you for taking the time to reach out to us. We sincerely apologize for any convenience. Unfortunately, our Raxial Booster Fans are not designed to be plugged into the Digital Thermal Controller included with our Cloudline Series of Inline Duct Fans. We will, however, forward your message to our product development team to gauge interest. If you have any other questions, please contact our customer support department directly through our company website and one of our Customer Service Agents will be happy to assist you. Kind regards, The AC Infinity Team -

Product features

Premium Solid Steel Body

This booster fan boasts a matte black aesthetic that expresses the heavy-gauge construction and its high quality. The galvanized steel body has no folded seams, enabling the fan to perform with low noise and no rattling. It also features crimped ridges on the exhaust end for a tight, secure grip on your flex or rigid ducting.

Speed Controller

All models include a speed controller to optimize airflow and noise. The soft rotating knob provides ease of use and quick responses to changing conditions.

High Performance Motor

Uses an AC motor that spins smoothly and relatively silent. Capable of high airflow boosting in applications like active intake for grow tents.

Long-Lasting

Features a 67,000 hour lifespan, using balanced steel blades and lubricated ball bearings that eliminates the need to maintain the fan.

Tight and Secure Lock

The aviation ports are easy to plug in and tightly secures each other using a retainer that also keeps moisture, dust and debris out.

• Designed to ventilate hydroponic grow rooms, transfer heating/cooling, cool AV closets, and exhaust odors.
• Intelligent controller with temperature and humidity programming, fan speed control, timer, and alarm system.
• Mixed flow design combined with a PWM-controlled DC or EC-motor for a truly quiet and energy efficient performance.
• Kit also includes corded sensor probe, AC power plug, two duct clamps, and required mounting hardware.
• Duct Size: 4” | Dimensions: 6.9 x 11.9 x 7.4 in. | Airflow: 205 CFM | Noise: 28 dBA | Bearings: Dual Ball

User questions & answers

Question:	Can this fan be used as a dryer vent booster
Answer:	I would not recommend putting any fan in a dryer vent. Dryers don't catch all the lint and the rest blows out the vent. That lint is often somewhat sticky, particularly when fabric softener is used. A fan would create a place for all that lint to stick and it would quickly become covered. If you attempt it, make sure you can easily remove the fan for cleaning. Also it might be a fire hazard as the motor might expect a certain amount of air flow for cooling and the lint could plug that up causing it to over heat. The lint would then be excellent tinder. Ideally for your application a boost fan would not provide an obstruction to the air flow and would work on the venturi effect. Basically injecting high speed air at the edges to speed up the larger volume of flow in the middle. I don't think anyone makes such a fan however. The only example I can think of is the fan make by Dyson and sold as "bladeless" though it really has blades in the base. It is designed for another purpose however and cannot be used in your duct. I presume this is a gas dryer. Due to the hazards of it not venting properly, the best thing to do is probably to find a way to cut an exit hole closer to the dryer and use a shorter vent pipe. Electric dryers can be vented indoors thru a filter box that catches any remaining lint. That will increase the indoor humidity though.
Question:	Can this fan be used to draw radon gas out of my basement if exhasted outside
Answer:	I am using this for a radon fan. The radon numbers were in the 60s before the fan. After installing it, we have dropped down to 2-7 range. I'm going to add a second one and forgot get the binders to the same area of 0-2.
Question:	Would it work to install this fan through the house wall so that I can bring the cool, outdoor evening air indoors without having the windows open
Answer:	Hi Nikki!Thank you for your inquiry.We usually do not recommend bringing out door air directly into the house, it has to be conditioned first and its often better to just recirculate air. Depending on the amount of airflow you were looking for, that would be the determining factor. These units move quite a bit of volume of airflow and are primarily used in filtering or moving air from room to room. You would have absolutely no problems operating this unit in a room-to-room or exhaust fashion! We greatly appreciate your interest and consideration in regards to our cooling products!Warm Regards,Tommy KaragiasAC Infinity
Question:	What is the CFM, wattage, and decibel level
Answer:	To help alleviate confusion, wanted to chime in here to say the answer posted to this question is outdated from an OLD model. This product has had two improvements since... one is that the fan is now running on a 24v motor, and the CFM is now measured at 205 (improved from a 12v motor at 152cfm). As for noise, I don't think the decibel rating has changed as it is still quiet. The second improvement is much more recent (Decemenr 2018) and was made to the controller unit which now includes humidity control as well as temperature.

Product features

A Quieter and Smarter Inline Fan

The new CLOUDLINE series contains a cutting-edge Electronically Commutated (EC) motor, controlled using precise electronic pulses and smart programming. This enables the inline fan to operate considerably quieter and reach low speeds without generating noise or heat. The EC motor is also twice as energy-efficient and can save up to 40% in energy costs, paying for itself in the long run.

Smart Programming

T-series models include a programmable controller with precise temperature and humidity sensors located on the 12-foot corded probe.

Quiet PWM Motor

Each fan uses a quiet, energy-efficient EC motor controlled using Pulse Width Modulation (PWM). Dual ball bearings allow for omnidirectional mounting.

Mixed-Flow Design

Featuring a mixed flow design, the fans maintain peak performance in high static pressure environments. Ingress-protected against dust and liquids.

Plug and Play

The complete kit includes the inline fan unit, controller, user manual, and everything needed to mount the fan and power it through an outlet.

CLOUDLINE 4-Series

A CLOUDLINE T4 plus CLOUDLINE S4 system can be linked to the same smart controller, and used in conjunction for a total of 410 CFM airflow. This set-up is ideal for ventilating smaller grow tents and cooling AV rack cabinets.

CLOUDLINE 6-Series

A CLOUDLINE T6 plus CLOUDLINE S6 system can be linked to the same smart controller, and used in conjunction for a total of 804 CFM airflow. This set-up is ideal for large grow tents, AV closet cooling, and boosting airflow for HVAC projects.

MIX and MATCH

The same controller can connect CLOUDLINE fans of different sizes, to share the same programming. For example, an exhausting CLOUDLINE T6 with a filter can share the same controller as an intaking CLOUDLINE S4, to balance static pressure.

• ADVANCED MADE EASY: Don’t waste time buying and returning parts that may or may not be compatible or safe to use together! Three-part system includes every part you need to get set up.
• POWERFUL AIR FLOW FAN: Heavy hitting blower with a fan speed of 2450 RPM; Puts out only 50 dB noise level. Moves air through your target location efficiently for optimal ventilation.
• SUPERIOR CARBON FILTER: 1050+ RC 48 Australian Virgin Charcoal Bed. Dimensions: 6'' x 18''
• EFFECTIVE ODOR CONTROL: The carbon filter eliminates some of the most undesirable odors, pungent smell and particulates from indoor grow tent, hydroponics grow room.
• STURDY DUCTING+ 2 Stainless Clamps: Strong, flexible steel wire supports heavy duty triple layer duct walls.PET core is sandwiched in layers of fire-retardant aluminum that can handle temperatures from -22 to 266 Fahrenheit.

User questions & answers

Question:	My tent is being sucked inwards any tips to prevent this? I left some holes opened at the bottom but ended with a bug problem
Answer:	Get a 6inch intake fan also and it will equalize the pressure. I won’t buy anything from Vivoson all junk. Get a real inline fan from any other company would be better. I can hear my fans 30 feet away outside my house they get super loud. Total junk. And I thought they were quiet lol. Took about 2 weeks before the bearing started to go out. Dont get screwed by this company like me and several others.
Question:	I'm looking into a 48x48x80 tent ... but I think the sinch holes are 8 inch will this still work
Answer:	Yes, the 6 inch should work. You could contact the tent manufacturer and double check just to be on the safe side. Good luck.
Question:	Will this entirely remove all marijuana smells
Answer:	it will remove the smell, however when you open your grow space door you will smell the Mary J, just not as loud as you would if the scent was just trapped in there
Question:	Hi, how do i firmly attatch this fan to the carbon filter before hanging in my tent
Answer:	Great question because the brace does not work. I McGrubered the crap out of my set up....probably an easier way than duct tape, lift hooks, bungees, and adding weight to the back of the filter by another hanging object I have to ensure to does not come apart. So far, working...also, have to duct tape with hose to the fan...that brace did not stay in place.

Product features

Inline Fan

• Safe temperature range for operation: - 104℉ to 149℉; Safe air-humidity range: 5% to 95% RH (Relative Humidity)
• Presence of electrically-conductive air particles: the air in the area of operation should be free of significant concentrations of electrically-conductive particles such as active carbon, ferrous powders, etc.
• Suitable for green rooms / grow tent (hydroponics), hospital rooms, commercial cooling and industrial applications.

Ducting & Clamps

• Made from high quality aluminum, temperature resistant, corrosion proof, and durable.
• Three-layer thickness: (Aluminum Foil + PET + Aluminum Foil): Flame-retardant coating; Temperature range: -22 to 266 Fahrenheit.
• Built-in steel wire for reinforcement and lasting performance.
• Flexible length for exhaust fan blower / inline fan; quick and easy to set up.
• Perfect for Heating Ventilation & Air Conditioning (HVAC), Kitchens, Bathrooms, Greenhouses, Grow Rooms, Grow Tents, etc.

Powerful Fan

Heavy hitting blower with a 440 CFM.

Reversible Flange & Base

Provides a 53% open area which allows for increased air flow.

Two duct clamps

Included in the package.

Two Reversible Ways

Intake Filter & Exhaust Filter

Four Common Methods

• EFFECTIVE VENTILATION: Powerful blower with a fan speed of 2500 RPM for an air flow of 195 CFM. Moves air through your target location efficiently for optimal ventilation
• EFFICIENT DESIGN: Lightweight, compact fan takes up minimal space; ideal for applications where larger fans just won’t fit. Efficient flow deflector feature increases air flow while cutting noise output.
• LOW NOISE LEVEL: Fitted with a flow deflector that concentrates the fan stream and cuts turbulent kinetic energy to reduce sound output to just 30 dB
• EASY INSTALLATION: Flanges on both the intake and exhaust ends for simple and easy hookup and a cord length of 5.9 feet for hassle free setup.
• VERSATILE APPLICATIONS: Use anywhere that would benefit from improved air flow to reduce humidity, clear the air and lower temperatures in grow rooms, greenhouses, basements or kitchens; Can be used with a variable speed controller (bought separately)

User questions & answers

Question:	This fan runs on ac or dc power
Answer:	110 ac
Question:	Why is it when I went to pay for the 4” inline fan that was listed at for $25. 98 it went up to $35. Free shipping items $25 or more... Lies
Answer:	Because Amazon doesn't like you, obviously....lmao, nah never count on free shipping unless you have Amazon Prime, and the item has the word Prime in blue with a check mark...otherwise, expect a charge for shipping regardless of the item's description or Amazon's cost analysis. These items are oftenly sold by third party vendors, and Amazon can't always accurately estimate shipping costs for them.
Question:	Can you attach a variable speed controller to this
Answer:	You can, however, with just 200 CFM of air movement you may want to just keep it on full. The motor will make more humming noise if you use a speed controller to decrease speed. I found it makes less noise on full than it does if you decrease the speed which increases motor hum noise considerably.
Question:	Is my fan defective? For such a small fan it is extremely loud
Answer:	Use light weight clipper oil on the moter behind fan blades, also use tape to hold to pieces together after twisting back together. I own three need to add oil to all. All have been running non stop for over 6 months.

Product features

VIVOSUN 4 Inch 195 CFM Inline Duct Ventilation Fan

VIVOSUN inline duct fan helps with ventilation issues. This fan is built durable, runs smooth and quiet. Durable plastic fan housing and blades for extremely low noise.

Product Features

Diameter: 4 inch

Power Supply: 110/120V

Power: 28 W

Speed: 2500 RPM

Air Flow: 195 CFM

Cord Length: 5.9 feet

Application Scenarios

Used as intake fan to bring fresh air into grow rooms; Also used as exhaust fan in smaller setups with LEDs or Lights under 400W.

• Effective ventilation for medium to large grow tent set ups, HVAC air boosting, heat, exhaust of heat, odor, humidity.
• Built-in variable speed controller allows to select any output between 60% and 100%. Motor Uses 205W.
• Mixed-flow design and quiet motor generate 735 CFM and sound output of 60 dBa (ducted).
• Designed using removable duct ends with locking tabs. Pre-wired (6FT) for easy installation. Includes mounting bracket.
• Duct Size: 8 in. | Dimensions: 12 x 9 x 9 in. | Airflow: 735 CFM | Noise: 60 dBA | Motor: 205W, AC, Brushless | Max Environment Temperature: 140°F.

User questions & answers

Question:	how long is power cord
Answer:	4-5’ I believe.
Question:	Was this fan designed with fan speed controllers in mind? Will using one increase the noise level and/or shorten the life of this fan
Answer:	Hi Robert,Yes, these inline fans can be used with variable fan speed controllers, but there are two things you need to keep in mind:1. Not every fan speed controller unit will work with this fan. We can guarantee that TerraBloom Variable Fan Speed Controller (sold separately on Amazon) does work with booster fans including this one, however, we can't guarantee that any speed controller on the market will work the same because many of them are designed for larger centrifugal fans and we received feedback from customers that they didn't work. 2. The adjustable speed range of the motor of this booster fan is roughly 20-25%, which means that you can decrease the speed roughly by quarter of the overall power before you will start hearing motor "hum", which is a sign that the fan's motor is not getting enough power to operate as designed. Do not decrease the speed of your booster fan past that point, because if the motor is left "humming" it will decrease the useful life of the unit. You can safely decrease the output of this fan by around 20-25% before the hum will be audible and it will significantly reduce the sound produced by the movement of air though the fan (it will be much quieter!) without putting extra strain on the motor and jeopordizing its useful life. Hope this helps!Best regards,TerraBloom
Question:	How quite is this fan
Answer:	The fan is extremely quiet. I can barely hear it. I'd guess, and it's a guess, maybe 45 decibels. Maybe 1.0 sones
Question:	How many decibels
Answer:	I don't have a way to measure the decibels. I have mine about 3 feet from the exit of my duct work with a thin air filter at the end to keep bugs out. So there isn't much material to muffle the sound but my exact setup is silent when standing 15+ feet away. Otherwise alone the unit sounds like a restroom exhaust fan, just a little more smooth. I hope this helps you, good luck with your project.

• TerraBloom EC duct fans are used in indoor grow facilities and vertical farms, heating and cooling transfer, commercial drying and air filtration applications. Our inline blowers can also create negative pressure environments, simulate wind, exhaust odors and smoke as well as intake fresh air from outdoors
• Built with cutting edge brushless EC Motor and dual jet type blades, this blower delivers 160 CFM airflow rate using just 18 Watts at max speed. It translates into only $45 annual cost of 24/7 operation at max speed using $0.29 average cost per KWH. Our fans don’t “purge” or waste electricity at lower speeds
• Our EC fan gives you a unique flexibility of controls – choose any speed from 0 to 100% using the included variable speed controller without creating background noise or hum at low speeds. Or choose to upgrade to a wireless remote control (Model: ECMF-WR) or intelligent thermostat speed controller with temperature programming (Model: SC-ECMF). This fan also supports PWM and 0-10V controllers via 3.5mm audio port
• Coated aluminum housing resists rust, protects motor and blades from accidental damage and harsh elements to reduce maintenance in demanding applications. This fan has IPX4 ingress protection rating. This is fan is extremely compact and fits into spaces with minimal clearance
• Duct Diameter: 4” (98mm) * Airflow: 160 CFM * Power 18W * Noise: 28-56 dBA * Pressure: 334 Pa * Bearings: Dual Ball * Size: 6.3 x 7.3 x 5.9 in. * ETL Listed * 2 Year Warranty

User questions & answers

Question:	Is the shipping discreet
Answer:	Hi Daniel, You will need to select an option to gift wrap your order so that Amazon ships it in a additional box. We do not package or ship our fans directly to Amazon customers, it is done by Amazon staff from Amazon warehouses. Best regards, TerraBloom Team
Question:	Does this fan have a dc motor? and is it pwm controlled
Answer:	This fan has a EC motor, which is a subtype of DC motors. Key difference is that it doesn't require a DC adapter since the conversion of electricity current happens inside the fan instead of DC adapter. The fan is controlled using Potentiometer technology and it yields exactly the same results as PWM.
Question:	In a pets grooming salon dogs hair is flying all over the place when we blow dry the dogs. Can this unit be used to suck the dogs hair to a canister
Answer:	Hello, Unfortunately, this fan will not work well for your application. Pet hair will be getting stuck inside the unit and getting wrapped around the impeller and fan's rotor, which can potentially increase chances of overheating and malfunction. If you still decide to us it for this application you need to ensure that there is a filter placed before the fan which will catch all of the hair before it reaches fan's parts. This somewhat defeats the purpose, as you want the hair to go into a canister and not to be trapped on the filter surface before the hair reaches the fan. Hope this helps. Best regards, TerraBloom
Question:	Can this be used to move grinding and welding smoke
Answer:	If it is just smoke, then it won't be an issue for the fan. But you need to make sure there won't be any hard particles going into the fan, as they can damage the blade and the motor.

Product features

100% Controllable Quiet EC Motor

Built with a state-of-the art EC Motors, these super-efficient fans deliver an unprecedented amount of airflow using 40-75% less power compared to AC fans. Controlled by a computer chip on board these motors allow for precise speed adjustment without any energy waste and heat.

Compact Metal Case

We know that vertical space in a grow tent is always tight. That’s why we build our fans with compact and airtight IPX4 ingress rated metal casing. Our units are built to handle high pressure applications with long ducts and carbon filters, while preserving the room for your light fixtures and budding flowers.

ETL Listed for UL 507

Cultivation with scale requires custom solutions. Our fans can be integrated into your custom automated environment management systems which support PWM or 0-10V signals. Our fans are ETL listed and conform to UL standards 507, Certified to CSA Standard C22.2 No 113 for United States and Canada

100% Speed Variable Dial (Included)

Our fans are 100% speed controllable. Each set includes a continuous variable dial controller, which allows you to select any speed without any extra hum or noise.

6 Speed Wireless Remote (Optional)

We offer an optional wireless remote controller, which works through walls and ceilings from up to 50ft distance. Select from 6 speed options with 16% speed step.

Programable 6 Speed Thermostat (Optional)

SC-ECMF thermostat speed controller allows you to program the settings for automatic speed changes. You can select your desired temperature and ambient speed level.

8 Speed Digital PWM Controller (Optional)

PWM digital speed controller with 8 speed options (12.5% speed step). No guessing, select your desired speed level precisely and accurately with this easy to use one button controller.

• HOUSEHOLD APPLICATIONS: Help to boost airflow in HVAC units to remove exhausts and odors from bathrooms & workshops and ventilate basements & attics, etc.
• UPGRADED ADVANTAGES: Superior balanced blades for long service life & quiet operation; Motor features a permanently lubricated bearing that operates quietly and requires no maintenance; Portable and lightweight; Sufficient 5.5' grounded power cord
• SPECS.: Diameter 4 inch, Speed 2930 RPM, Air Flow 100 CFM, Voltage 110/120V, Power 12W
• GROW ROOM APPLICATIONS: Used as intake fan to bring fresh air into grow rooms; Also used as exhaust fan in smaller setups with LEDs or Lights under 400W.
• NOTE: Max Operating Temp of Motor is 130℃ / 266℉; Max Ambient Temp is 60℃ / 140℉. If any other materials/particles get into the duct fan and get the blade stuck, users are to turn off the power immediately, clean it up, turn the power back on when handled properly.

User questions & answers

Question:	Can this be mounted vertically without harm to the motor or bearings? Answers from mfg or installation instructions only please. Thank you
Answer:	I don’t have the installation instructions anymore to reference sorry
Question:	Would this fan properly vent a 1000w hps lamp
Answer:	I am cooling two 600 W HPS lamps with a single fan and it works well
Question:	Can this fan be used to help with drafting on a wood stove? In line at top of chimney
Answer:	If you use it to move air into the stove pipe from an outside source, the fan can be outside with a duct that enters the stove pipe midway. This would act like a venturi to force air upward. Think about adding a 45 degree t to your pipe and using this fane to draw cold air from outside and forcing it upwards in the pipe. You don't waste warm air and you get a really stoked fire.
Question:	Can you hook up a speed control to this booster
Answer:	You can hook up a speed control but it does not work very good and was not designed for one. When you start cutting down the power, the fan struggles and eventually stops leaving a loud humming or buzzing sound which does not sound good for the fan and may pose a fire hazard. If you want a variable controlled fan, just buy a fan that has variable control. I made the mistake of buying variable control with this fan. I ended up buying another fan that I could use this variable control on and it is more powerful and much quieter.

Product features

VIVOSUN 4 Inch 100 CFM Inline Duct Booster Fan

VIVOSUN inline duct fan helps with ventilation issues. This duct booster fan is perfect for boosting airflow in long runs of ducting. Tight, precise construction eliminates rattling and reduces wear and tear to give the element a long life.

Features

Application Scenarios

Used as intake fan to bring fresh air into grow rooms; Also used as exhaust fan in smaller setups with LEDs or Lights under 400W.

• EFFECTIVE VENTILATION: Powerful blower with a fan speed of 2550 RPM for an air flow of 390 CFM. Moves air through your target location efficiently for optimal ventilation
• LOW NOISE LEVEL: Durable plastic fan housing and blades for extremely low noise(<37 dB); Variable speed controller for easy fan speed adjustment.
• EASY INSTALLATION: Removable duct ends with locking tabs for quick removal and easy maintenance and a cord length of 5.4 feet for hassle free setup.
• VERSATILE APPLICATIONS: Suitable for industrial, household and horticulture ventilation applications for air clean and temperature control.
• NOTE: Comes with an installation bracket indicating the direction of the airflow. Max Ambient Temp is 104℉ / 40℃

User questions & answers

Question:	Would the 4" fan work ok if I used an adapter and connected it to a 2" pipe? Would the extra resistance damage the motor
Answer:	Maybe. This is actually for a 6" duct, so that may be even more of an issue.
Question:	Would the 4" fan work ok if I used an adapter and connected it to a 2" pipe? Would the extra resistance damage the motor
Answer:	I would not reduce it that much.. buy a 2 inch fan
Question:	Do you have in 230v 60hz
Answer:	No, 120v
Question:	is it really quiet
Answer:	I have the 8" -- it is NOT quiet at all. 75dBA at a meter when set full speed; and still 68dBA when set full minimum speed. Nowhere close to the 40dBA spec they claim.

Product features

VIVOSUN 6 Inch 390 CFM Inline Duct Fan with Speed Controller

VIVOSUN inline duct fan helps with ventilation issues. This fan is built durable, runs smooth and quiet. Durable plastic fan housing and blades for extremely low noise; Variable speed controller for easy fan speed adjustment.

Features

• Diameter: 6 inch
• Power Supply: 110/120 V
• Power: 67 W
• Current: 0.55 A
• Speed: 2550 RPM
• Air Flow: 390 CFM
• Noise Level <37 dB
• Max Ambient Temp is 104℉ / 40℃.

Application Scenarios

Used as intake fan to bring fresh air into grow rooms; Also used as exhaust fan in smaller setups with LEDs or Lights under 600W.

Product description

Embedded duct fan

A powerful and quiet embedded duct fan is designed to quietly ventilate the hydroponic growth room, enhance the heating/cooling of the room, circulate fresh air, exhaust items, and cool the AV closet. The duct fan adopts a series mixed flow design, which can maintain airflow even in high static pressure applications. Contains an EC motor with PWM control to achieve quiet and energy-saving performance. The complete kit includes a duct fan unit, two duct clamps, installation manual, and all necessary installation hardware.

100% controllable silent EC motor

The fan body integrates a 0-100% variable speed dial, which is a continuously variable dial controller, allowing you to select any speed without any hum or noise. Compared with AC fans, its power is reduced by 40-75%, thus providing unprecedented airflow. These motors are controlled by a computer chip on the board, allowing precise speed adjustment without wasting energy and heat.

Quiet and Energy Efficient Design

Features an EC-motor that is controlled using PWM (Pulse Width Modulation). This technology enables motors to be able to run smoothly at extremely low RPM speeds without generating additional heat or noise. In addition, the duct fan uses a mixed-flow design using a stator blade and dual hydrodynamic wind circles. This gives it a high static pressure rating, enabling it to deliver airflow even in applications where air movement is being restricted. The motor houses dual ball bearings rated at 67,000 hours which allows the duct fan unit to be mounted in any direction. The unit is IP44 rated to be highly resistant to dust and liquids, and performs well even in harsh environments.

• MICROMALL 6” Inline Duct Fan are used in indoor grow facilities and vertical farms, heating and cooling transfer, commercial drying and air filtration applications. Our inline blowers can also create negative pressure environments, simulate wind, exhaust odors and smoke as well as intake fresh air from outdoors
• EC fan provides flexible control speed – choose any speed from 0 to 100% using the included variable speed controller without creating background noise or hum at low speeds. Or choose to upgrade to intelligent thermostat speed controller with temperature programming (ASIN Model: B08JZFMJ84 ). This fan also supports PWM and 0-10V controllers via 3.5mm audio port
• Quiet and energy-saving performance is very good: EC motors with mixed flow design and PWM control can use precise electronic pulses. This allows the embedded fan to run more quietly and reach low speeds without generating noise or heat. The energy efficiency of EC motors is also twice as high, and can save up to 40% of energy costs, and can recover costs in the long run.
• PACKAGE DETAILS: Quiet 6” Inline Duct Fan, AC power plug, two conduit clamps and required installation hardware.
• DUCT DIAMETER: 6”(150mm) — Airflow: 370-402 CFM —Power 50W —Input voltage：AC110~220V,50/60Hz —Speed：2500RPM/min —Noise: 32 dBA —Pressure: 502 Pa — Bearings: Dual Ball —Size: 12.4x8.03x9 in. —2 Year Warranty

Product description

TerraBloom 4 Inch (98mm) Duct Fan Low Noise Series Description

TerraBloom “LowNoise Series” 4 Inch Fan (Model: LN-DBF-4) is a super silent duct fan for small to medium spaces.

This duct fan delivers 47 CFM of Air Movement, while using only 9 Watts of Power. That is at least 30% savings over the same size fans in the same category. Depending on your location this fan pays for itself in energy cost savings within 12-24 months

When operated at full speed, this inline fan generates only 25 dBa of noise, that is as quiet as ambient noise is a suburban home or less than half of the volume of a regular tone conversation

This duct fan is engineered and assembled in Germany of local and imported parts

This fan is not waterproof and not suitable for outdoors applications

Warranty

We stand behind our products and provide 2 Year Warranty on this inline fan. Please contact us through Amazon for Warranty Service, and we will process it for you without extra hassle.

Disclaimer

Buyer acknowledges that by purchasing TerraBloom products, buyer has special knowledge on installation and use of the product or has consulted a professional on the product’s installation and use. As with any electrical appliance, buyer should exercise caution at all times when operating this fan.

• IMPORTANT NOTE ON FAN USE: This is a Light Duty inline fan that Generates 47 CFM (Cubic Feet Per Minute) Airflow. It is Not Suitable For Carbon Filter Applications. For Carbon Filter Applications Please Consider More Powerful Fans that Generates 150+ CFM of Airflow
• 4" (98 mm) INLINE FAN INCLUDES: 4 Inch (98 mm) Outside Diameter x 6 Inch Length Fan, 8 Foot Grounded Power Cord, Mounting Bracket for Flat Surface Mounting With Hardware
• HOUSEHOLD APPLICATIONS: This Premium Built Inline Fan Designed To Exhaust and Intake Air Through 4" Ducts in a Quietest Way Possible. Sound Pressure Level at Full Speed is 25 dB(A) Only.
• FAN VENTILATION SPECS: Airflow 47 CFM, Power 9W, Voltage 120V, Speed 2250 RPM, 0.11Amps. For Indoor Use Only in Environment With Max Temperatures Not Exceeding 113F. This fan is not suitable for fireplace or furnace applications.
• WARRANTY: This Inline Fan is Covered by 2 Year Warranty. Contact Us through Amazon For Service.

User questions & answers

Question:	Is the mounting bracket detachable
Answer:	The mounting bracket is detachable. But the tube does have little guide pieces that the mounting bracket slides into and then screw mount in. So those guides stick out a tiny bit.
Question:	Can I use it as a quiet duct booster to increase air flow to cool or warm rooms
Answer:	Yes, the primary purposed of these duct fans is to intake cooler air from the outside into your warm room or to exhaust warm air from the room to the outside.
Question:	Just bought this 6” fan. The user guide says there is a special screwdriver to adjust speed, etc. this tool was not included in the package. Why
Answer:	I didn't know it's adjustable
Question:	I connected the fan worked ok for part of the evening then stopped. The yellow heat gauge is blinking yellow and fan is not running
Answer:	Hello Robert and Nancy, First of all, you fan is OK and this issue can be resolved. You either had a power spike/outage in your area or have connected the fan to am external rheostat type speed controller, which have cause the fan's motor to reset. It needs your input in order to turn back on, we do provide the instructions for that, however, all of the messages we tried sending you through Amazon were undelivered, which might be a result of your preferences in Amazon Buyer-Seller Communications. We've tried to send you a message 3 times and all 3 times show that the message is undelivered. Please try to contact us at [email protected] and we'll send you the instructions via email. I am also pasting the steps on how to resolve this issue below (the formatting of the text might not be the best, but the steps you need to follow are all outlined below) : Silent Series - Configuring Fan’s Motor Minimum Speed Setting after Power Reset 1. Turn the motor speed control knob (located on the right side) to extreme counterclockwise position to turn off the fan. 2. Set the temperature control knob (located on the left side) to the extreme left position (corresponds to 70°F). 3. Turn the speed control knob to extreme clockwise position (corresponds max speed setting) to start the fan, then immediately turn the fan off by turning the speed control knob to extreme counterclockwise position (until it clicks indicating its turned off). This operation looks like a fast "turn on - turn off". Don’t leave the fan in the “turned on” position for longer than 2 seconds, as it will return to the initial state and you’ll have to start again from Step 1. 4. Set the temperature control knob to the extreme right position (corresponds to 95°F). 5. Perform a fast "turn on - turn off” exactly the same as in Step 3. 6. Set the temperature control knob to the extreme left position (corresponds to 70°F). 7. Turn the speed control knob to extreme clockwise position (corresponds to max speed setting) to start the fan and leave it there. After 2 - 3 seconds from the starting moment, the yellow LED will flash at a low frequency, indicating that the minimum speed setting mode is on. You can now adjust the minimum speed of the fan by turning the temperature control knob, once the desired minimum speed is found, leave the temperature control knob in the desired position and turn the motor speed control knob to extreme counterclockwise position to turn off the fan. The fan’s minimum motor speed settings are now configured for the current frequency and voltage and saved in the module memory. Best regards, Steve TerraBloom Customer Support