12 best 4 duct fans

• 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.

Product description

Product Description

An inline fan for duct boosting designed to improve airflow in heating and air conditioning applications, and ventilate home rooms like attics, workshops, bathrooms, and kitchens. Each fan uses an easy-to-use knob controller that adjusts fan speed for your specific airflow boosting needs. It features a unibody framework that helps reduce vibration and ensures smooth and low-resistant airflow. The matte black steel cylinder is fluted and ridged for easy and secure installation in-between ducting. Permanently lubricated dual ball bearings spin the balanced steel blades and allow the fan to be mounted in any orientation. This kit includes one AC powered inline booster duct fan, a speed controller with a power plug, mounting screws, and a cable management set.

Speed Controller

The inline variable speed controller can control the fan’s speed and turn it on or off. Turning the knob will increase or decrease the fan speed and optimize airflow and noise levels for your application. Its speed range includes a low, medium and high threshold, producing up to 106 CFM and 28 dBA in noise. This speed controller uses a female aviation plug with a metal retainer, tightly securing its connection to the booster duct fan.

Applications

This versatile inline booster fan is made to be installed in between ducting for various applications that need improved air delivery. In households, it boosts airflow from HVAC units to remove stale air and odor, ventilating attics, workshops, kitchens, basements etc. In grow tents, grow rooms, and indoor gardens, it’s primarily used as an intake fan to bring in fresh air. Please note this booster fan cannot be used standalone in high static pressure applications like room ventilation. Additionally, it is not suitable for use in applications with restricted airflow like systems that use carbon filters. For higher performance, see the CLOUDLINE Series.

• A duct fan designed to boost 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: 4” | Dimensions: 7.28 x 3.95 x 3.95 in. | Airflow: 106 CFM | Noise: 28 dBA | Bearings: Dual Ball

User questions & answers

Question:	Would this product be able to run dual voltage of at least
Answer:	If you don't mind the loud beep every time it turns on or off. My unit has an issue where it does this constantly.
Question:	I want to build a small airbrush box and looking for a very quiet fan. Would this be powerful enough to pull in the spray paint through a filter
Answer:	about 6-8 feet long
Question:	Besides price and how they look, how are Raxial units different from Cloudline
Answer:	I don't think it comes apart
Question:	Can you add a carbon filter
Answer:	No, we did not face any issues with smell. It's excellent! Even Oprah uses this same model :-) Hope you too enjoy it.

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.

• 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.

• 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.

Product description

Features:

√ Energy Efficient - Consumes up to 60% less power

√ Compact Design - Yet Powerful Ventilation with 195 CFM air flow at 5,000 RPM

√ Brushless DC Motor - Quiet Operation, Lasts 3x longer than AC motors

√ Variable Speed Controller - 0 to 100% speed control in 1% increments

√ Multiple Mounting Options - Hardware kit included for wall mounting



Package Includes:

1× 4'' Duct Fan (with a 6 ft. power cable and 3-prong plug)

1× Speed Controller (with 16-ft cable)

1× Installation Kit (Includes screws and anchors)



Specifications:



Model: ES4

Duct Size: 4 Inches

Air Flow: 195 CFM

Rated Speed: 5,000 RPM

Maximum Pressure: 335 Pa

Noise Level: ≤ 37 dB

Speed Controller: Potentiometer 0-100%

Environment Requirements: 15-140 °F, 15-93% RH

Water Proof: IP44

Certification: ETL Listed

Power Supply: 120V, 60Hz

Rated Power: 18 W

Current: 0.16 A

External Material: Aluminum Alloy

Weight: 2.7 lbs

Dimension: 6.26 x 7.24 x 5.91 in

• 【Multiple Applications】 Designed for increased air circulation and moisture/odor removal in grow tents, greenhouses, bathrooms, server rooms, A/V equipment, or industrial workshops.
• 【Outstanding Ventilation】The ES4 delivers an airflow of 195 CFM at 5000 RPM with only 18 watts of power. Our brushless DC motor performs 30% more efficiently with 60% less power consumption than AC motors.
• 【Quiet Operation】Whisper-quiet operation is possible thanks to the variable speed controller. Adjust from 0-100% fan speed to without any increase in humming or buzzing sounds.
• 【Durable Construction】 Engineered with an airtight steel case and IP44 waterproof protection in a compact design, the ES4 will stay running in harsh environments, big or small.
• 【Easy to Use】The duct fan and controller can be mounted with no additional assembly. The permanently-lubricated bearing reduces wear and tear to cut down on maintenance.

User questions & answers

Question:	what's the air flow CFM and pressure of this vent fan
Answer:	Yes it can be clipped the thread that holds it on is very loose
Question:	I have a grow room with a temp of 115 degrees farenheit by how many degrees will it drop the temp? Just an estimate thanks
Answer:	Yes , it perfect for My 3 month grandson .It is so cute that we take many photos for him.
Question:	does it come with hose clamps
Answer:	yes,it also can be weared as daily hat and pants. we get comments from people everywhere when our baby wears this hat ,we love it so much
Question:	What plug does this unit come with
Answer:	I couldn't tell you exactly the dimensions because I can't remember but I can tell you that I am a mom who over packs (you never know) and I still have a little extra space! I have a lot of mom friends and this bag has the most space from all the diaper bags I've seen

• EFFECTIVE VENTILATION: Powerful blower with a fan speed of 2300 RPM for an air flow of 190 CFM. Moves air through your target location efficiently for optimal ventilation
• LOW NOISE LEVEL: Durable plastic fan housing and blades for extremely low noise(<31 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 5.9 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:	No.It is only the hat and pants.
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:	No it does not come With the product
Question:	Do you have in 230v 60hz
Answer:	It will be too big. I purchased it for my son's newborn shots, but he couldn't fit it until his 2 month photo shoot (12 lbs). It is super adorable though!
Question:	is it really quiet
Answer:	Yes. The Bow is stitched on

Product features

VIVOSUN 4 inch 190 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: 4 inch
• Power Supply: 110/120 V
• Power: 59 W
• Current: 0.8 A
• Speed: 2300 RPM
• Air Flow: 190 CFM
• Noise Level <31 dB
• Max Ambient Temp is 110℉ / 45℃.

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.

• EFFECTIVE VENTILATION: Fan speed is 2500 RPM, Air flow is 195 CFM. Powerful blower for optimal ventilation
• REASONABLE DESIGN: The light and compact fan takes up the smallest space; it can also be used in a small space. The efficient baffle function can increase airflow while reducing noise output
• LOW NOISE: The deflector makes the fan airflow more concentrated and reduces the turbulence energy, thereby reducing the sound output to only 30 dB
• VERSATILE APPLICATIONS：Suitable for growth room, greenhouse, basement or kitchen, improve air circulation, reduce humidity and lower temperature
• SIMPLE INSTALLATION: The flanges on the intake and exhaust ends can be connected easily and easily. The cable length is 5.9 feet and can be easily set

User questions & answers

Question:	Is there a speed controller on this unit
Answer:	Yes, it can fit under the plane seat.
Question:	Is this suitable for dryer vents
Answer:	It may be a little big but not too bad. I had my 1 week old in it and it did what it was supposed to do for pictures! I would do it if I were you!

Product features

GROW TENT

GROW ROOM

BATH ROOM

Product description

Model: 4 inch inline duct fan

Rated voltage: 110V

Rated power: 12W

Rated frequency: 60Hz

Speed: 2400 r / min

Air volume: 76CFM / 130m³ / h

Shell material: ABS

Size: ø4" / ø100mm

Bearing Type: Sleeve

• Widely Used -- The 4" inline duct fan is widely used in homes, offices, warehouses, restaurants, bars, shops, shopping malls, grow tents, greenhouses and other places where a lot of air is needed.
• Large Airflow -- It is designed with high quality sleeve motor, quiet and service life more than 3 years, with rotational speed 2400 r/min, 76 CFM large airflow.
• Over-heat Protection >> The motor comes with low operating temperature and low heat generation, the built-in temperature protection device, the contact point is disconnected when the motor overheats, which acts as a power failure protection. double protection is safer.
• DIY Your HVAC System >> You can supply fresh air with one or more fans to DIY air circulation systems depending on the size of your space.
• Easy to install >> only connect it with 4" ventilation pipe, 39" cable (with no plug), brown live wire, blue neutral wire, easy to install, please fix the fan to avoid noise due to looseness.

User questions & answers

Question:	Can this fan be used to help continuosly vent a wet or damp basement
Answer:	10.6 L, 4.9 W 5.1 H
Question:	Does it have a ground wire? What gauge
Answer:	No,
Question:	Will this fan automatically turn on when sensing intake air flow and turn off if intake air flow drops off
Answer:	Yes, easily.
Question:	The fan is e perfect size but I need it reverse flow. Is there another fan that that has reverse flow available
Answer:	The dimension of this bag before expand is 18"(Height)*12.4"(Length)*6(width), after expand the demension is 18"(Height)*12.4"(Length)*9.5(width)

Product features

Details

Model: SF-LFI-09S

Rated voltage: 110V

Rated power: 12W

Rated frequency: 60Hz

Speed: 2400 r / min

Air volume: 76CFM / 130m³ / h

Shell material: ABS

Size: ø4" / ø100mm

Bearing Type: Sleeve

Installation Precautions:

1. Installation location: You can purchase 1 or more according to your needs, connect it in the middle or both ends of the pipeline, or install it in the wall, DIY your own air circulation system.

2. Space requirements: Do not vent in one direction in a closed environment. The installation environment requires intake and exhaust to ensure air circulation and avoid air pressure difference due to too much air flow.

3. About wiring: Each exhaust fan has a 40cm standard wire, you can configure the plug or power switch according to your own needs.

4. About noise: 30-40 dB, If you are installed in the bedroom, please try to stay away from your bed.

5. About speed: If you think the air volume is too large, you can equip him with a speed control switch to control its air volume. Or you think that the air volume is not enough, you can add more ventilation fans.

You only need to connect the fan to the middle or end of the exhaust duct.

Vent for your bathroom

Vent for your kitchen

Provide fresh air for growing tents

• POWERFUL AIR FLOW FAN: Heavy hitting blower with a fan speed of 2300 RPM for an air flow of 190 CFM, Puts out only 31 dB noise level. Moves air through your target location efficiently for optimal ventilation
• SUPERIOR CARBON FILTER: 1050+ RC 48 Australian Virgin Charcoal Bed. Dimensions: 4" x 14"
• EFFECTIVE ODOR CONTROL: The carbon filter eliminates some of the most undesirable odors, pungent smell and particulates from indoor grow tent, hydroponics grow room.
• FREE PRE-FILTER INCLEDED: We recommend replace the pre-filter every 6 months or after completion of each grow cycle.
• VERSATILE APPLICATIONS: Kitchens, Bathrooms, Greenhouses, Grow Rooms, Grow Tents, etc

User questions & answers

Question:	Can the blowing direction of the fan be inverted with the switch or works only in one direction? I see the filters does, it works for intake/exhaust
Answer:	china
Question:	Will this work and be powerful enough for a 2x4x5 grow tent
Answer:	Hi, in Anti-Freeze mode, the unit keeps the room at a temperature of 45°F to prevent freezing temperatures. Eco Mode; the appliance will automatically set the power level to guarantee the best comfort reducing energy consumption. In this operating mode, the unit may switch the heating power level from maximum to minimum and vice versa, several times in an hour. When using the ECO function, the maximum temperature setting is 79°F. To activate this function, press the ECO button. Thank you!
Question:	Will this for sure cool down my tent ? I have 300w light, I raised it but still 3-5 degrees too hot, please help
Answer:	No, it is for the amount of time you want it to run before shutting off
Question:	Can you provide a transformer to be able to run in a 240v environment? for New Zealand
Answer:	Doubtful. This heater starting malfunctioning on me less then 1 year after getting it. It would shut off with out notice. I assume it was overheating. Not a very reliable model. I ended up getting a dyson hot+cold afterwards and it's been good (Expensive but seems to be built like a tank).

Product features

Inline Fan

• Energy efficient & quiet operation
• Lightweight & super easy to install.
• Balanced blades are ideal for boosting air supply and venting exhaust air.
• Engineered for maximum boost with minimum noise.
• Motor features a permanently lubricated bearing that operates quietly and requires no maintenance.
• Solve air delivery problems without major system rework or expense.
• Can be installed in any location, such as greenhouses, tents, etc.

Carbon Filter

VIVOSUN Carbon Filters are perfect for the following applications:

• Grow tents, cupboards and cabinets.
• Anywhere without a roof/ceiling cavity to displace extracted air into.
• Air-cooled lighting.
• Lower-level floors of double/triple story houses.
• Window to window ventilation applications.
• Hot or cold "filtered air transfer" from one air conditioned room to another.

Inner & Outer Mesh

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

Reversible Flange & Base

Intended for longer service life, up to 2 years in life expectancy.

Two Belts

Included in the package.

• 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.

Product description

VENTISOL 4 INCH Duct Fan Inline Fan for Household / Grow Room Ventilation Item Specifications:

-Diameter: 4 inch

-Power Supply: 110/120V

-Power: 12 W

-Speed: 3,000 RPM

-Air Flow: 100 CFM

-Cord Length: 5.4

feet Key Features: -Perfect for boosting air flow in long runs of ducting

-Energy efficient & quiet operation

-Lightweight & super easy to install

-Fluted on both ends to receive ducting

-Balanced metal blades are ideal for boosting air supply and venting exhaust air

-Engineered for maximum boost with minimum noise

-Motor features a permanently lubricated bearing that operates quietly and requires no maintenance

-Solve air delivery problems without major system rework or expense

-Can be installed in any location, such as bathrooms, attics, greenhouses, tents, etc.

• Widely Used for Ventilating: The 4” duct fan is made of steel construction with powder coated in black, designed to ventilate hydroponic grow rooms, help boost airflow in greenhouses, tents, basements, attics,warehouses, homes, and other places where need to remove exhausts and odors.
• Specifications.: Diameter 4 inch, 3,00 RPM, Air Flow 100 CFM, Voltage 110/120V, Power 12W
• Quiet Operation: Superior balanced blades are engineered to minimize noise and vibration, longer service life and quiet operation. They are ideal for boosting supply air, return air, or venting.
• Over-heat Protection: Please note that Max Operating Temp of Motor is 130℃ / 266℉; Max Ambient Temp is 60℃ / 140℉. And the motor is built-in a thermostat, the contact point is disconnected when the motor overheats, which is a double safer device.
• Package Contents: 4 Inch Booster Fan(4in Diameter x 6 inch length), Instructions Manual. pre-wired with 5.4 feet power cord.

User questions & answers

Question:	I would like to know how many cfm the 12" fan can move
Answer:	Hi, The fabric could be treated with a water repellent product to make it water resistant. ok for light rain and drizzle. suggest do not use it in the heavy rain. thank you.
Question:	Can run continuously
Answer:	Hi. Unfortunately not. The removable insert will but the whole organizer together is too wide/deep. A Kelly 28 is (28 m x 22 cm x 10 cm) = inches : 11.02 x 8.66 x 3.93 our organizers are: Medium 10.6" W x 5.9" H x 4.9" D and Large 11.4" W x 7.1" H x 5.9" D
Question:	Temperature range
Answer:	You don’t even know it’s there! It s a handy product. Mine is sitting in a mid size LV tote.
Question:	will this product work with a speed controller
Answer:	The Velcro is on the outside ends. I didn’t receive any straps. I don’t use them for anything, but you can pinch them together to fit the organizer into a smaller bag.

• EFFICIENT FAN - Quiet and efficient design, work well in ventilating grow tents, transfer heat or cool rooms, circulate fresh air, and control proper humidity, temperature, and air quality for your grow area; Be aware that 195 CFM is the maximum value of air flow tested at ZERO atmospheric pressure
• PREMIUM CONSTRUCTION - Blades are made with high-quality components for smooth, whisper-quiet operation; Ultra-accurate craftsmanship of the centrifuge reduces noise and vibration; Compact design means minimal use of space and will fit in any grow room
• LOW NOISE - Fan runs at 2930 RPM with 195 CFM of airflow; Fan is equipped with a flow deflector to cut noise output; Runs at 30 dB noise level to ensure your grow operation won’t disturb your life
• EASY TO INSTALL - Simply affix the exhaust and intake mounting flange together with locking tabs, no tools or screws required; The housing, even the impeller and blades, are easy to detach for cleaning and maintenance
• WIDE APPLICATIONS - Clean and freshen the air for your plants, keeping your environment cool and balanced, ideal for indoor ventilation and odor filtration; Widely used in pharmacies, bakeries, cafes, grow tents, hydroponics, bathrooms, greenhouses, basement workshops, etc

User questions & answers

Question:	How loud is this? I plan to use it around family.. Going to build a powerful difuser
Answer:	These little only assist to build pressure inside the duct. They have no power to be an exhaust fan.
Question:	Can this fan be used as a radon mitigation fan
Answer:	No I put it in a bathroom 8 in vent not very strong.
Question:	Thinking of getting 1 does anybody know how long the power cord is
Answer:	Usually warm air holds more moisture than cold . Condensation can be prevented by insulating your duct work. Your airconditioner both cools and dehumidifies your air. Climate is different in different areas of the country. In some desert areas you can cool your home without airconditioning by using a swamp chiller. Air is blown over chilled h2o. Again the humidity of outside air is important. Insulation is also important.
Question:	How does it perform under static pressure? Is there a data sheet I can look at
Answer:	No, it does not install via hardwiring it into the electrical system. It plus into a standard out and has the control switch attached to the power cable.

Product features

VIVOHOME 4 Inch 195 CFM Plastic Round Exhaust Inline Duct Fan

VIVOHOME Inline Duct Fan is an ideal solution for ventilating your home, business, greenhouse, or tent. Quiet and powerful, this fan will move or circulate air wherever you need and expel bad smells.

Product Features

• Material: Plastic
• Color: Black
• Condition: 100% brand new
• Air flow: Max. 195 cfm
• Package Dimensions: 8.3"L*7.8"W*7.2"H
• Item Weight: 3lbs
• Package Inlcude: 1 x Inline Ventilation Duct Fan