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AC Infinity

AC Infinity CLOUDLINE A4, Quiet 4” Inline Duct Fan with Speed Controller

  • Based on 486 reviews
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Availability: In Stock.
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Arrives Monday, Aug 31
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Size: 4-Inch


Color: Speed Controller for A4


Features

  • Designed to quietly ventilate grow tents, exhaust odors, transfer heating/cooling to rooms, and cool AV closets.
  • Features the same build quality and innovations as the CLOUDLINE Series delivered in a value package.
  • Includes a wired 10-speed fan controller; also compatible with all CLOUDLINE Series smart controllers.
  • Mixed flow design combined with an EC-powered motor for a truly quiet and energy efficient performance.
  • Duct Size: 4 | Dimensions: 6.9 x 11.9 x 7.4 in. | Airflow: 165 CFM | Noise: 29 dBA | Bearings: Dual Ball

Description

AC Infinity is a technology company that specializes in environmental controls for agricultural and HVAC applications. Our smart controllers and integrated grow equipment are designed to work together to create the perfect climate for your plants. Reimagined for those on a budget but want the quintessential CLOUDLINE experience. Engineered with quiet and energy-efficient performance that rivals that of the CLOUDLINE PRO but in a value package. Connect this duct fan to CONTROLLER 69 or later (sold separately) and download the AC Infinity app to access custom activation using climate triggers, grow cycles, scheduling, and automation programming. Create automation for your devices to systematically manage your grow tent environment. Set customizable alerts that can trigger to almost any event. Interactive graph intuitively displays temperature, humidity, and VPD data. Input target figures to help your grow tent approach and maintain your ideal environment. Stay on top of what's happening in your grow space using alerts and notifications so you can quickly counteract any environmental spikes. CLOUDLINE A4 CLOUDLINE A6 CLOUDLINE A8 CONTROLLER 69 PRO

Brand: AC Infinity


Color: Speed Controller for A4


Electric fan design: Exhaust Fan


Power Source: AC


Style: Cloudline A4


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


Room Type: Indoor


Special Feature: Programmable


Recommended Uses For Product: Inline Duct Fan


Mounting Type: Downrod Mount


Power Source: AC


Room Type: Indoor


Special Features: Programmable


Recommended Uses For Product: Inline Duct Fan


Mounting Type: Downrod Mount


Controller Type: Button Control


Number of Speeds: 10


Noise Level: 29 db


Wattage: 7.2 watts


Number of Blades: 10


Air Flow Capacity: 165 cfm


Speed: 2800 rpm


Voltage: 120 volts


Indoor Outdoor Usage: Indoor


Control Method: App


Standby Power Shutoff: High Efficiency


Number of Power Levels: 10


Motor Type: EC


Installation Type: Mounted


Material: Polypropylene


Blade Material: Plastic


Specification Met: CE, RoHS


Color: Speed Controller for A4


Electric Fan Design: Exhaust Fan


Style: Cloudline A4


Finish Type: Matte


Collection Name: Inline Duct Fans


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


Blade Length: 7.4 inches


Cable Length: 6 feet


Size: 4-Inch


Brand Name: AC Infinity


Included Components: Cord, Remote


Model Name: CLOUDLINE LITE A4


Model Number: AI-CLA4


UPC: 819137021747


Number of Packs: 1


Unit Count: 1 Count


Part Number: AI-CLA4


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Aug 31

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

    • Moves some air!
Size: 4-Inch Color: Speed Controller for A4
The AC Infinity CLOUDLINE A4 Quiet 4” Inline Duct Fan has set a new standard of excellence in the realm of ventilation technology. From its whisper-quiet operation to its unmatched performance, this fan stands head and shoulders above its competitors. What truly sets the CLOUDLINE A4 apart is its advanced design and innovative features. First and foremost, the whisper-quiet operation of this fan is nothing short of remarkable. Even at full speed, it produces minimal noise, making it ideal for environments where noise pollution is a concern. This feature alone sets it apart from other inline fans on the market. In addition to its quiet operation, the CLOUDLINE A4 delivers exceptional airflow performance. The precision-engineered fan blades and powerful motor work in perfect harmony to move air efficiently and effectively. Whether you're ventilating a grow tent, cooling a server rack, or maintaining optimal airflow in a HVAC system, this fan gets the job done with ease. The built-in smart controller adds another layer of convenience and functionality to the CLOUDLINE A4. With the ability to adjust fan speed, set timers, and monitor temperature and humidity levels, it offers unparalleled control over your ventilation system. The user-friendly interface makes it easy to customize settings and fine-tune performance to meet your specific needs. Durability is another area where the CLOUDLINE A4 shines. Constructed from high-quality materials and built to withstand the rigors of continuous use, this fan is built to last. Whether you're a professional HVAC technician or a DIY enthusiast, you can trust that the CLOUDLINE A4 will provide reliable performance for years to come. Overall, the AC Infinity CLOUDLINE A4 Quiet 4” Inline Duct Fan is in a class of its own. Its combination of whisper-quiet operation, exceptional airflow performance, advanced features, and durability make it the clear choice for anyone in need of a superior inline duct fan. Simply put, it's the best of the best. ... show more
Reviewed in the United States on February 4, 2024 by Matthew A.
    • Deceptive marketing but still love the fan.
Size: 4-Inch Color: Speed Controller for A4
Edit: I like this fan way to much to leave the one star review in place. I still stand by my original reasoning but can't help liking and even emphatically recommending this fan based on how well it works and the overall look and feel of the build quality. At the second of 10 speeds the sound from the fan itself is hard to discern although there is a very noticeable woosh from the air itself flowing through the opening of the tube on my desk. Even at this low speed it seems to provide enough ventilation for me. Original review (1 star): Ignore the noise ratings and probably any claims really. It's a fan. It sounds like a fan and moves air like a fan. The whisper soft 29dba or w/e it is supposedly rated for is more like 70+ in reality. Based on how grossly that was misrepresented I can only imagine the airflow and power ratings are likewise no where near reality. That all being said, I really like the fan I received. It's not what was advertised but I pretty much expected that going in so... The noise is pretty loud at mid to high settings but is mostly a loud but soft woosh sound and with the hose attached I doubt it would bother most people. I plan to use it for venting solder fumes and it will likely be plenty powerful at it's lowest settings which is actually almost silent to it's credit, although customer service on their website flatly stated the unit was tested for sound at max speed with hoses off. Can't give it 5 stars because the fan does not live up to the promises in the listing, but it's a pretty good fan none the less, just know what you are getting into. If you need to rely on the specific performance data for any reason I would suggest buying something legit, otherwise if you just need a fan this one's pretty decent. ... show more
Reviewed in the United States on August 3, 2023 by Pete
    • Trustworthy
Size: 4-Inch Color: Speed Controller for A4
Its very silent in low setting. It works very well for fume extraction. Remote control can be put on a magnet and the size is very good for the suction power
Reviewed in the United States on June 13, 2026 by Scarecrow
    • Works well for home fresh air
Size: 4-Inch Color: Speed Controller for A4
Review Image by D. Hoover
This fan has worked well for the fresh air system in our home. I do admit as soon as you hook it up to a flex duct, the airflow goes way down as the 4” one isn’t crazy powerful. I’m actually using 8” ducts with the 4” fan at this point without shrouds and it flows a good amount of air. It runs from a screen in the soffit to the fan, into the filter box, out of the filter box to mix with recycled air, and into my dehumidifier. The speed control works well to dial in the amount needed to keep pollutants at a low level inside. Overall, a good fan! I also installed a portable system in my mother’s mobile home and for one person, the 4” setup is perfect. ... show more
Reviewed in the United States on March 9, 2024 by D. Hoover
    • Smell 95% reduced.
Size: 4-Inch Color: Speed Controller for A4
Been using it a year for my laser cutter. It’s pretty quiet and sucks well.
Reviewed in the United States on June 15, 2026 by Leslie L Shafer
    • Very good, esp. for small or non stealth grows.
Size: 4-Inch Color: Speed Controller for A4
I bought a T6 (3 yrs ago), then an S4 (2 yrs ago), then 3 PC fans, several carbon filters, and now finally an A4. All of them exceptional quality, flawless performance since day 1. As other reviewers have stated, A4 is a lil bit louder than the S4. Still waaaay quieter than odd-shaped metal Vivo Z4 i replaced with it. Unless ur purchasing smallest A-series fan for largest possible space, relatively louder sound levels at higher settings will not come into play. My A4 is exhausting 2x4 space thru carb filter on setting 2 of 10 and is nearly imperceptible, on 6 its officially too loud. My 5x5 is exhausted by T6 that never needs to go beyond setting 4 of 10. Higher exhaust fan settings completely unnecessary to control smells and is actually counterproductive. Got more complete scrubs of exhausted air by carbon filters by turning exhaust fans down as low as possible. If u have the extra $20, get the S4 instead, it's worth the $ diff but the A4 is a quality fan from an unimpeachable supplier at entry level price point. ... show more
Reviewed in the United States on May 28, 2023 by Johnald Duggan
    • Quiet ventilation for 3D printer
Size: 4-Inch Color: Speed Controller for A4
This inline fan is sturdy and very quiet! I am using it to ventilate a 3d printing space and it mounted easily to the bottom of a table and moves a very high volume of air, keeping the room free of particulates. The included remote allows you to set the fan speed with a lot of granularity. Maybe the only drawback is that the fan remote requires a cable connection and that cable is short. ... show more
Reviewed in the United States on November 27, 2025 by el duderino
    • Great for laser engravers
Size: 4-Inch Color: Speed Controller for A4
Review Image by okieladybug
The exhaust for my laser engraver was quite powerful enough for me and this duct fan has the suction power I was looking for. I like how it is adjustable with controller so I can go low suction power to high suction power as needed.
Reviewed in the United States on July 14, 2026 by okieladybug

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