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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 Nov 14 – Nov 15
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Size: 4-Inch


Color: 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: Pro Speed Controller


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: Bathroom, Kitchen


Special Feature: Bladeless


Recommended Uses For Product: Air Circulation, Cooling


Noise Level: 28 Decibels


Brand: AC Infinity


Color: Pro Speed Controller


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: Bathroom, Kitchen


Special Feature: Bladeless


Recommended Uses For Product: Air Circulation, Cooling


Noise Level: 28 Decibels


Wattage: 21 watts


Finish Type: Matte


Number of Blades: 10


Air Flow Capacity: 205 Cubic Feet Per Minute


Blade Length: 7.4 Inches


Speed: 2800 RPM


Voltage: 240 Volts


Included Components: Cord, Remote


Indoor/Outdoor Usage: Indoor


Model Name: CLOUDLINE S4


Control Method: App


Efficiency: High


Cable Length: 144 Inches


Is Cordless?: No


Number of Power Levels: 10


Motor Type: EC motor


Manufacturer: AC Infinity


Installation Type: Versatile Mounting (Horizontal or Vertical)


UPC: 819137020290


Global Trade Identification Number: 90


Size: 4-Inch


Item Weight: 5.68 pounds


Item model number: CLOUDLINE S4


Is Discontinued By Manufacturer: No


Date First Available: July 19, 2018


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Nov 14 – Nov 15

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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Similar Products

Top Amazon Reviews

    • AC Infinity CLOUDLINE PRO S6 – Quiet and Powerful Cooling for My Miner Room
Size: 6-Inch Color: Pro Speed Controller
I purchased the AC Infinity CLOUDLINE PRO S6, 6” Inline Duct Fan with Speed Controller to help keep my miner room cool, and it has exceeded expectations. The EC motor is both powerful and efficient, and what surprised me most is just how quiet it runs, even at higher speeds. Installation was straightforward, and the included speed controller makes it easy to adjust airflow as needed. Running multiple miners can heat up a room quickly, but this fan has made a huge difference — it keeps temps under control without adding a lot of noise or power draw. The build quality feels premium, and I can tell it’s designed to run continuously without issues. ✅ Pros: Very quiet operation, even at high speeds Strong airflow to keep miner room temperatures down Speed controller included for precise adjustment Efficient EC motor saves power over time Solid build quality, designed for 24/7 use ❌ Cons: Higher upfront cost compared to budget inline fans Speed controller cable could be a little longer 💡 Tips: Use insulated ducting to further reduce noise. Mount the fan with vibration-dampening straps for an even quieter setup. Pair it with a temperature or humidity controller for automatic adjustments. Clean the fan and ducts periodically to maintain peak airflow. Bottom Line: The CLOUDLINE PRO S6 is a top-tier ventilation fan that’s perfect for high-demand environments like mining rooms, hydroponics, or grow tents. It’s quiet, efficient, and powerful — exactly what you need for reliable cooling in a 24/7 setup. ... show more
Reviewed in the United States on August 25, 2025 by Kenny Campbell
    • Top shelf gear for the home grower. Highest quality I have seen. So impressive.
Size: 4-Inch Color: IP65 Speed Controller
AC Infinity has changed the game of home growing for everyone. This fan is priced very well for the level of quality and features it packs. I plugged it into my AC Infinity AI controller and it detected it without hardly any intervention. Since I am not growing plants, but gourmet mushrooms I needed to disable the AI (broke my heart because its truly amazing) and set it manually at the precise numbers I needed. High humidity and low CO2 for fruiting. I had trouble getting it to accept the numbers I wanted since I was not growing standard plants. Called support and had Judy on the line with zero wait time. Judy was a controller ninja and walked me through the clicks to get exactly what I needed set up. Perfection! She didn't ask a million questions, didn't have to go through a painful data collection pre call, just picked up the phone and asked how she could help me. I explained my issue and she had a solution in minutes. Made sure it worked for me and was a pleasure to work with. I don't call support for anything, even at work, unless I am totally dead in the water with no options. AC Infinity made me rethink this stance. The fan itself works great. 10 different settings. Perfect for a mushroom grow tent thanks to the true waterproof rating. Humidity won't even touch this thing. The fan looks sleek and runs silent. I see there is a sound damper available but can't imagine why one would need it unless they sleep next to the tent because its so quiet. The setup was quick and easy. It moves a ton of air and keeps the FAE spot on in my tent. I love the AC Infinity products. I already had a fan and filter and 2 humidifiers that I swapped out just so I could use them with the controller and have more matching gear. I want to set up a garden inside now since this system is so easy to use and works so well. ... show more
Reviewed in the United States on August 27, 2025 by Steebo
    • Great Inline Fan
Size: 6-Inch Color: Pro Speed Controller
The media could not be loaded. I bought this fan to use with my Xtool laser machine. I am extremely excited about how well it works. It was not very difficult for us to install it in my basement and vent it out through a window. It is super easy to use. It is not as loud and the air purifier I was using. I would recommend this fan over and over again. The way it is helping my laser not only function better but keep fumes and smoke out of my room is amazing for the price. This is a great value. It seems to more than powerful enough and is sturdy and looks well built. ... show more
Reviewed in the United States on June 12, 2025 by Dee Dee Hartke
    • Great fan, can be dangerous though
Size: 8-Inch Color: Pro Speed Controller
The fan works great and has a wide range of performance that allows you to run this thing at any speed between silent and very loud. I use mine as part of a DIY ventilation system for an old apartment and it provides loads of air movement and static pressure. At full blast, I measured its power draw at 165 watts. The fan is notably very efficient and can still move a surprising amount of air at its lowest speeds with around just 5-10 watts of power usage. (Though you won't be ventilating a whole space at that level.) One thing to seriously note though: This fan can be a real safety hazard if not used correctly. It should really have some feature to kill the power easier since at full blast this fan will happily consume any nearby debris and probably result in injury if you were to get your hand in it. There is no built in grill or safety screen. The controller allows for the selection of 10 speeds, but requires you to loop through to the highest speed before it will shut off. Additionally, when you remove the controller by disconnection, the fan defaults to FULL power. I had an incident where the fan swallowed a bag of small screws and I had to hastily chase down the power plug in order to shut it off. I guess as a testament to its durability though the fan didn't seem to suffer any damage. I have since included a shutoff switch in-line with the power cord. ... show more
Reviewed in the United States on July 28, 2025 by Mikel Lindsey

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