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AC Infinity

AC Infinity CLOUDLINE PRO S4, Quiet 4” Inline Duct Fan with Speed Controller – EC Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics

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Availability: 15 left in stock
Fulfilled by Amazon
Arrives Thursday, May 2
Order within 11 hours and 23 minutes
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Size: 4-Inch PRO, Speed Controller


Features

  • Designed to ventilate grow tents, transfer heating/cooling to rooms, circulate air, exhaust odors, and cool AV racks.
  • Features a wired 10-speed fan controller; also compatible with all UIS controllers with intelligent programming.
  • PWM-controlled EC motor provides quiet and energy-efficient performance with minimal heat and noise.
  • Mixed flow design with stator blade and hydrodynamic wind circles enables airflow delivery in high resistance areas.
  • Duct Size: 4 | Dimensions: 6.9 x 11.9 x 7.4 in. | Airflow: 205 CFM | Noise: 28 dBA | Bearings: Dual Ball

Product Dimensions: 11.9"L x 6.9"W x 7.4"H


Brand: AC Infinity


Voltage: 240 Volts (AC)


Wattage: 21 watts


Cooling Method: Air


Compatible Devices: Transmission Coolers


Noise Level: 28 dB


Maximum Rotational Speed: 27000 RPM


Air Flow Capacity: 205 Cubic Feet Per Minute


Product Dimensions: 11.9"L x 6.9"W x 7.4"H


Brand: AC Infinity


Voltage: 240 Volts (AC)


Wattage: 21 watts


Cooling Method: Air


Compatible Devices: Transmission Coolers


Noise Level: 28 dB


Maximum Rotational Speed: 27000 RPM


Air Flow Capacity: 205 Cubic Feet Per Minute


Item Weight: 5.74 pounds


Manufacturer: AC Infinity


Item model number: CLOUDLINE S4


Is Discontinued By Manufacturer: No


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, May 2

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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    • The Rolls-Royce of exhaust fans
Size: 4-Inch PRO, Speed Controller
This is my third, and likely last, exhaust fan I've bought for a project. I wanted an exhaust system for our cat's litter box cabinet so that it would create a small amount of negative pressure and pull the bad odors outside. This fan is absolutely perfect in every possible way and has far exceeded my expectations. I arrived at this fan, after purchasing two others that were just too loud, as the noise seemed to bother the cat. I installed 2" PVC in the wall behind where the cabinet is, because I needed something small enough to fit. I then had a 90 degree elbow coming out of the wall, through a cover plate and then going into the back of the cabinet. In the attic, I installed a 2" to 4" duct adapter onto the 2" pipe, ran 25' of flex duct to this fan, and then another 16' run of duct to the roof vent. While the first two fans where very noisy, even at the lowest speeds, this one is virtually silent. I'm running it on level 2 and cannot hear anything inside the cabinet or in the house. Since I'm restricting the intake to only 2", anything above level 2 would likely just be a waste of power. This setup is working perfectly and creates more than enough exhaust to do the job and it does it in silence. The prior fans moved the air ok but had a really annoying hum that could be heard through the ductwork and also inside the house through the insulated ceiling. I hear nothing with this one. In addition to the above, the fan is rock solid and came with EVERYTHING one could possibly need to install it, including hose clamps. It's almost overkill but shows attention to detail. It also came with a very nice instruction book (yes, it's a substantial book) with detailed instructions on every aspect of installation and operation. The speed controller is very nice and easy to use. I just set it to my desired level and forget it. It will remember its current setting and resume after a power outage. This fan cost a bit more but is absolutely worth every penny paid. The difference in quality and quietness cannot be matched. I could not be happier, cat is happy, and we have an odor-free home. ... show more
Reviewed in the United States on December 8, 2023 by R. Precourt
    • Well built. Does the job.
Size: 4-Inch PRO, Speed Controller
Review Image by Optimist Optimist
Review Image by Optimist Optimist
Review Image by Optimist Optimist
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Good quality construction and excellent packaging / accessories. I've been running it for a few months now, pretty continuously with no problems. The sound level definitely depends on the speed. I keep it around a setting of 6 or 7 which seems to strike a good balance between sound, and CFM flow. See Excel table in pictures. The CFM is subject to error as I just used a simple low-cost device to measure air-flow speed and don't know it's accuracy. (I'm using the fan to ventilate the house for better air quality, as a prelude to installing something like an ERV system). ... show more
Reviewed in the United States on March 8, 2024 by Optimist Optimist
    • Quiet, clean design, includes all hardware
Size: 4-Inch PRO, Speed Controller
Review Image by The Flying Dutchman The Flying Dutchman
Review Image by The Flying Dutchman The Flying Dutchman
Review Image by The Flying Dutchman The Flying Dutchman
This fan is being used to remove smells from my work shop (epoxy vapor, wood working, painting). It is a 13 x 11 work area which translates into just under 1200 cubic feet. This means that at full speed this fan can “turn” the area every 6 minutes. I drilled a 4” hole through the house rim so I can exhaust the smelly air outside. The power cable is about 8 ft long. The control cable is 18 ft which allowed me to place the controller in a good location. I love how it all came together, speed control is effortless. At the first three speeds there is almost no sound, after that the noise level gradually increases. At the 3rd speed I measure 40 db at 3 ft removed from intake Full speed registers at 63 db. The area itself registered at 35 db. For your reference the 40 db is virtually unnoticeable. For me this fan was worth every penny. The included documentation is very clear. As mentioned this fan comes complete with hardware, strapping, 4” band clamps…… Very Nice! ... show more
Reviewed in the United States on January 7, 2024 by The Flying Dutchman The Flying Dutchman
    • Solid, dependable, quiet
Size: 4-Inch PRO, Speed Controller
This delivers everything that the maker claims. I've used it for three years in a car build with no problems. It just keeps working quietly and working right. Highly recommend.
Reviewed in the United States on February 2, 2024 by draben
    • works well if used often
Size: 4-Inch PRO, Speed Controller
as mentioned, it does work well, very quiet but if it is not used often, it will not start when turned on via the remote. I have to unplug it, count to ten and plug it back in. then it will run. that is why I gave it 4 stars instead of 5
Reviewed in the United States on November 28, 2023 by Ruel Elliott
    • Insanely efficient and quiet fan
Size: 4-Inch PRO, Speed Controller
Using this in a 2x3 grow tent. Initial impression upon unboxing was - Quality! When I first installed it, I was impressed with how quiet it was but was expecting more negative pressure. I realized I had too many bends (including a 180) in my ducting, so I moved the tent around (now I have a 90 and three 45's) and got some wattage testing done at different settings. 50% power vents this tent now and it uses 6.3 watts and is nearly silent. 75% vents very well, is quiet, and still only uses 13.1 watts. At 100% power, it is overkill, a little loud, and provides too much negative pressure even with an active intake fan and passive intakes open... and that uses only 23.3 watts. At 50% it still provides negative pressure even with an AC Infinity 4" booster at full tilt as the only active intake (which is also a great fan but using 11.8 watts vs the Cloudline at 6.3 watts). If you have a smaller tent, this is all you will need for an efficient exhaust fan. It will efficiently scale up to accept a filter, a couple of bends in your ducting, and perhaps even a bigger tent. I wouldn't be surprised if it could do a 3x3 at full tilt. I looked at fans for a very long time before pulling the trigger on this one, and I am glad I did. I will likely be purchasing the upgraded "67" controller in the future. ... show more
Reviewed in the United States on August 6, 2021 by Kevin
    • Great fan and loved how easy it was to install and operate!
Size: 4-Inch PRO, Speed Controller
Review Image by Dustin Pearson Dustin Pearson
Replaced an older and frankly underpowered bathroom vent fan for our house with this S4 unit. Could not be happier. This fan pulls air from both our bathrooms and I have it controlled via a smart switch which will turn it off automatically after a hour. (that is probably longer than needed but some in my family like to take long showers). It is about the same sound level on high level as the fan it replaced....but this fan easily moves the air our at half of full speed. Standard 4" duct work is just a little to big but some foam insulation strips keep it nice and secure on there. ... show more
Reviewed in the United States on November 27, 2023 by Dustin Pearson Dustin Pearson

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