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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

  • Based on 4,114 reviews
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Availability: 15 left in stock
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Arrives Friday, Aug 1
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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

Brand: AC Infinity


Color: Black


Electric fan design: Exhaust Fan


Power Source: Corded Electric


Style: Modern


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


Room Type: Kitchen, Bathroom


Special Feature: Bladeless


Recommended Uses For Product: Cooling, Air Circulation


Noise Level: 28 dB


Brand: AC Infinity


Color: Black


Electric fan design: Exhaust Fan


Power Source: Corded Electric


Style: Modern


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


Room Type: Kitchen, Bathroom


Special Feature: Bladeless


Recommended Uses For Product: Cooling, Air Circulation


Noise Level: 28 dB


Wattage: 21 watts


Finish Type: Matte


Air Flow Capacity: 205 Cubic Feet Per Minute


Blade Length: 7.4 Inches


Voltage: 240 Volts


Indoor/Outdoor Usage: Indoor


Control Method: App


Blade Material: Plastic


Cable Length: 144 Inches


Manufacturer: AC Infinity


UPC: 819137020290


Global Trade Identification Number: 90


Size: 4-Inch PRO, Speed Controller


Item Weight: 5.64 pounds


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: Friday, Aug 1

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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Top Amazon Reviews

    • 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
    • Quiet, Reliable Duct Fan for Safe 3D Printing Ventilation
Size: 4-Inch PRO, Speed Controller
I bought this duct fan to help expel the fumes from my 3D printer outside, and it’s been a fantastic addition to my setup. It runs 24/7 on the lowest setting, providing continuous ventilation, and I only need to turn it up when actively printing. Despite the constant use, it’s quiet, effective, and has been completely reliable—no issues whatsoever. The fan is compact, which is ideal since it doesn’t take up much space in my setup, making it perfect for those using a vented enclosure for safer 3D printing. The button controls are also very easy to use; however, it can be a bit annoying if you accidentally skip over a level since you have to cycle through again—you can’t go directly backward. If you’re looking to maintain good ventilation and control fumes in your workspace, this fan is an excellent choice. ... show more
Reviewed in the United States on November 14, 2024 by David
    • My biggest fan!
Size: 4-Inch PRO, Speed Controller
UPDATE: This fan is still going strong! Over a year later with no drop in air flow. I checked with an anemometer. I'm an AC Infinity fan for life! This is a great little fan for grow tents! I have this in a Mars Hydro 2x2x5 tent, sitting on the top exhaust, blowing the hot air with no problems. When I first got it and plugged it in to test, I thought it was broken till I put my hand over the exhaust! It's that quiet at lower levels! Of course as you turn it up the noise level increases, but it is by no means over bearing or annoying. Just a soft whoosh. The included speed controller is extremely long and you shouldn't have any issues with finding a place to mount it. Also don't forget that this fan in comparison with others (vivosun I'm looking at you) will use substantially less power, less noise, and will probably last 100 times as long. Not kidding on that last one, go look at the reviews for Vivosun fans... Some people don't even get a month out if them! I don't know about you, but when it comes to my plants, I can't afford to lose a crop due to my fan dying and needing to wait for a replacement! Buy ONCE with good quality rather than multiple times with poor quality. ... show more
Reviewed in the United States on December 15, 2020 by W.B.
    • Quit
Size: 4-Inch PRO, Speed Controller
Works great and with very little sound and works even better with controller 69
Reviewed in the United States on June 14, 2025 by BullSkinner

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