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Internet # 318063751

Model # AI-CLS4

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Cloudline S4 Quiet 4 in. Inline Duct Fan Speed Controller Heating Cooling Booster Hydroponics Grow Tents Ventilation

$89.99
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  • To ventilate grow tents and transfer heating/cooling to rooms
  • Features an 8-speed manual controller utilizing PWM
  • Truly quiet and energy efficient performance w/ EC-powered motor
  • View More Details

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Product Details

About This Product

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.

Highlights

  • Designed to ventilate hydroponic grow rooms, transfer heating or 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 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 in., dimensions: 6.9 x 11.9 x 7.4 in., airflow: 205 CFM, noise: 28 dBA, bearings: dual ball
  • Click here for more information on Electronic Recycling Programs
  • Return Policy

Product Information

Internet # 318063751

Model # AI-CLS4

Specifications

Dimensions: H 11 in, W 10 in, D 14 in

Dimensions

Product Depth (in.)

14 in

Product Height (in.)

11 in

Product Width (in.)

10 in

Details

Amperage (A)

1.2 A

Brand/Model Compatibility

Universal

Duct Type

4" Round

Horsepower (hp)

0.271 hp

HVAC Product Type

Inline Duct Fan

Material

Steel

Maximum air flow (CFM)

205

Pack Size

1

Product Weight (lb.)

6 lb

Returnable

90-Day

Voltage (volts)

100/240

Warranty / Certifications

Manufacturer Warranty

2 Years

Questions & Answers

Can this unit be outdoors in the winter. No ice/snow on it, but in the cold below freezing.
ByOct 25, 2026
1 Answer | 
Answer This Question

Hello, The AC Infinity Cloudline S6 is not officially rated or recommended for sub-freezing outdoor operation. Key Technical Limitations: • IP44 Rating: The unit is rated IP44, which means it resists dust and splashes of water, not sub-freezing temperatures, deep cold-soaking, or harsh outdoor weather exposure. • Operating Temperature Limits: Similar AC Infinity climate and fan systems are engineered for an operating range of 32°F to 140°F (0°C to 60°C). Exposing the motor, lubricants in the dual ball bearings, and electronics/speed controller below 32°F can cause mechanical stiffness, bearing lubricant failure, or electronic component malfunction. • Condensation Risk: Even without direct snow or ice, cold outdoor air mixed with warmer indoor exhaust air creates heavy internal condensation. When temperatures drop below freezing, that moisture freezes inside the housing or motor, leading to ice jams or electrical shorts.

By|Oct 29, 2026

    (1)

    What size duct- hose is required for this unit?
    ByJun 11, 2026
    1 Answer | 
    Answer This Question

    Hello, I can confirm that a 6" duct will be needed for proper usage with this fan. Thank you for reaching out to us.

    By|Jun 13, 2026


      Can this fan turn on when the 110 volt AC outlet is enabled? I want to use as a bathroom exhaust fan and turn it on from the wall switch.
      ByApr 21, 2026
      1 Answer | 
      Answer This Question

      Hello there, Thank you for reaching out, I would like to inform you that yes, it will turn on/off with a switched outlet because the unit will remember its last state. Additionally, It runs on a standard 100–240V AC plug (normal outlet),But it’s not a native wall-switch bathroom fan. I hope this helps and if you have any other questions don't hesitate to reach out. Kind regards, Brittany Customer Support Agent AC Infinity Inc.

      By|Apr 22, 2026


        What is the DB operating sound level?
        ByApr 17, 2026
        1 Answer | 
        Answer This Question

        Hello there, The average decibel rating for the unit when operating a full max speed is 32 dBA. I hope this helps a bit more !

        By|Apr 17, 2026


          How many watts does this model use at full speed?
          ByMar 13, 2026
          1 Answer | 
          Answer This Question

          Hello ! Please be advised, the MAX power draw consumption is 70W but the average power usage is generally 38 W. Additionally, this unit uses 0.94 Amps relying on a 100-240V ac voltage. I hope this helps !

          By|Mar 14, 2026


            Will this fan pull air through a charcoal filter system and still deliver high CFM?
            ByFeb 17, 2026
            1 Answer | 
            Answer This Question

            Will this fan pull air through a charcoal filter system and still deliver high CFM?

            By|May 21, 2026


              Can this unit be used to circulate hot air from a wood stove?
              ByFeb 2, 2026
              2 Answers | 
              Answer This Question

              yes

              By|Feb 18, 2026

                Yes, you can use this can to circulate the hot air if you would like.

                By|Feb 4, 2026


                  How many CFM is this unit?
                  ByJan 2, 2026
                  1 Answer | 
                  Answer This Question

                  The total airflow/CFM for the Cloudline S6 will be 402

                  By|Jan 8, 2026


                    Viewing 1-8 of 28

                    Customer Reviews

                    4.9 out of 5

                    • 4.9 out of 56 reviews
                    • 96% recommend this product
                    Filter by:
                    Showing 1-10 of 56 reviews
                    Super quiet!
                    Wow, this is a very quiet fan! Perfect for those closet growers. Can be used to exhaust or circulate air for heating/cooling. Mounting hardware is included, but I don’t like the straps. I will be using a pulley. Fan must be directly plugged in to an outlet. Additionally, a controller is included and easy to program thresholds for temp/humidity, control fan speed fan etc. highly recommend!
                    by
                    • Recommended
                    Great fan
                    This fan comes with clamps, straps, and the hardware needed. It can be used as an intake fan or an exhaust fan. This fan is compatible with our AC infinity grow tent. This fan is very good for intake and exhaust functions. Sucks air and blows air very efficiently and strong. Just unscrew the motor cap and rotate to the desired setting. The fan measures approx. 12 1/2" long x 9" wide and has a 5 3/4" duct opening. It has a speed controller and can connect to a smart thermostat (which is separate). The fan is fairly quiet when running.
                    by
                    • Recommended
                    Perfect for Network Rack Ventilation
                    I used this for exhaust of network/server rack. I have cold air coming in from my basement hallway and needed an efficient way to exhaust the heat from above. This was perfect. I was able to mount it easily to a 2x4 on the ceiling. I used some 4 inch flexible tubing to move the heat away from my server and switches. The duct fan came with everything needed to install and more. It also has a wired remote that comes with a LOT of wire so you can mount it away from the unit. I would recommend this to anyone that is looking to move air quickly!
                    by
                    • Recommended
                    S stands for simple
                    I think. This is a very high quality Item as far as I can tell. I have not installed it as of this date as it is going into my northern home to boost a duct that is way to far from the furnace. This has a very simple push the button on / off with built in variable speed. Nice thing about the controller is that it remembers its last selected position. In other words if you set the fan to 1 or 5 or whatever and you lose power it will come back on in the same status. Ok this is important if you want to remote control an S style unit with a smart plug or a relay circuit that coordinates it with the furnace/ humidity switch or what ever. Bad thing about the switch is it's one way all the way up till off then start over again. The fan itself is quiet till you get into the higher speeds and is also IP44 rated. (An IP44 rating means that your product will be protected from solid particles that are over 1mm in size and from low velocity sprays of water from every direction.) With some duct mods it fits a 6 inch round duct ( coupling) The only difference between this and the T version is the control so if you don't need humidity or internet control or more than one fan this should do the trick. Comes with mounting hardware and instruction book
                    by
                    • Recommended
                    Great fan, very quiet
                    If your looking for a basic 6" inline fan then you should check out the AC Infinity Cloudline S6 Quiet 6 in. Inline Duct Fan Speed Controller Heating Cooling Booster Hydroponics Grow Tents Ventilation. Features a cutting-edge electronically commutated (EC) motor, controlled using precise electronic pulses and smart programming. This allows the fan to reach much lower speeds and also quieter then older speed modulators. 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.
                    by
                    • Recommended
                    Great 4" Fan
                    If your looking for a 4" inline fan then you should check out the AC Infinity Cloudline S4 Quiet 4 in. Inline Duct Fan Speed Controller Heating Cooling Booster Hydroponics Grow Tents Ventilation. Features a cutting-edge electronically commutated (EC) motor, controlled using precise electronic pulses and smart programming. This allows the fan to reach much lower speeds and also quieter then older speed modulators. 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.
                    by
                    • Recommended
                    Runs quiet
                    I chose the AC Infinity Cloudline S4 Inline duct fan for my 5x5 grow tent. The instructions were well written and had illustrations on how to hang the inline fan and duct work. Very easy to understand know special knowledge needed to install. I hope this fan with my grow tent will extend my growing season. I can not wait to show these products to my gardening friends.
                    by
                    • Recommended
                    Awesome and Powerful
                    I have a home made HVAC duct system in my work shop. Not being exactly well done, I needed to pull more air through a different part of the duct system. This in line duct fan is exactly what I needed. It is incredibly easy to install and works like a charm. It doesn't appear to minimize the other areas of the system, but increases the one that was not getting enough air flow. I simply installed it between two 6" metal ducts and used an aluminum foil tape to secure the ducts to the fan housing. It comes with pipe large clamps if ou are securing it to flex duct. The fan itself was simple enough to screw into the OSB wall. The controller is a simple push button speed controller. Be sure when installing it to have the direction correct. There are arrows on the housing to indicate the flow direction. The fan is really quiet. Not that a loud one would make much of a difference in my shop but if you used it in an area where the noise would matter this one is very quiet. For an inline duct fan this works great.
                    by
                    • Recommended
                    Quiet 4 in. Inline Duct Fan Speed Controller Heating Cooling Booster Hydroponics Grow Tents Ventilation
                    I measured some power usage and read 6.9 watts on low setting and 40 watts on high setting. All eight settings are distinct and work. This fan is absolutely quiet. Mounting was a breeze and value of the fan is great. I’ve had many in-line exhaust fans installed and this is the best by far. Uses 1/5 the watts for the same air movement as many centrifugal fan. Absolutely one of the highest quality products I’ve come across in my life of 52 years of it. I’m rating this shortly after test installation. Judging from look of it and from the quality, I expect this unit to last for a long time. I will change my rating if it does not.
                    by
                    • Recommended
                    1 found this review helpful
                    Nice in-line fan
                    This AC Infinity Cloudline S4 Quiet 4 in. Inline Duct Fan with Speed Controller can be used as an in-duct Heating/Cooling Booster or for hydroponics grow tent ventilation. It is well designed and well built. It is easily disassembled to allow solid attachment of the base to any surface and for cleaning the interior. Power is supplied by a plug-in adapter. The controller is easy to use and sets the speed in 8 preset levels. The fan is almost silent at lower speeds and quiet at high speed under a modest load. It is a nice unit. Mounting hardware is included.
                    by
                    • Recommended
                    Showing 1-10 of 56 reviews