AC Infinity CLOUDLINE S6, Quiet 6” Inline Duct Fan with Speed Controller

I purchased the AC Infinity CLOUDLINE PRO S6 to use as a booster fan for my portable air conditioner. I had previously bought a cheaper inline exhaust fan, but it was extremely loud and stopped working after only two months. So far, this fan has been amazing. The amount of air it moves while remaining quiet is impressive. I only need to run it at about half power, while the cheaper fan had to run at full power constantly and still did not perform as well. I definitely recommend spending the extra money on this fan. It feels well-built, performs exceptionally well, and should ultimately cost less than repeatedly replacing cheaper fans. It has been money well spent.

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.

DAY 1: WHY I BOUGHT THESE I bought these hoping to find a 6" fan that could move some air gently, without causing the sound and fury of a small cyclone in my recording studio. With voice over work, extraneous noise is a problem. So is heat, and air!, because VO rooms are usually completely closed off the the outside world. They get hot and stuffy without proper air flow. This is the answer. I have tried 6 different claimed-to-be-quiet fan solutions via Amazon and YouTube reviews... this is unequivocally the best for my situation. I unboxed and hooked one of these up (not to my room, because that will require some ducting and electrical changes) in an untreated echo-y basement room with a hard tiled floor. So no mounting yet, no ducting yet, just the fan on the floor with its 10-level USB-C controller, and me holding my iPhone running the app "SPLnFFT" noise meter at about 12" above the center of the fan, airflow running unimpeded from left to right on the floor, The iPhone was held level so I could read the display. Here are a few hasty values. Starting point: Fan at 0 = 30db (A) This is the room's noise floor when nothing is turned on. The meter terms this level as "Almost Silent". Fan at speed 1 = 37db (A) The meter calls this "Very Quiet". Fan at speed 2 = 45db (A) The meter labels this "Quiet." Fan at speed 3 = 53 db (A) "Comfortable" Fan at speed 4 = 60 db (A) "Moderate" ASIDE: Note that these levels are purely "in the moment," not carefully measured. Use these approximate numbers as a rough estimate only if you are similarly seeking a quiet, controllable fan solution. I did "round off" to the nearest dB, so 37.2 became 37. Keep in mind I intend to use 2 of these fans, 1 to send fresh air into the booth from floor level, and 1 for pulling warm air out of the booth above eye level. I don't want a wind tunnel, simply fresh air moving through the space via insulated, flexible ducting to help keep the air flow noise reduced as it travels into and out of the booth. I anticipate that once installed, I can record spoken/sung material without concern for air noise. Even at speed 1, the air flow felt pretty good. At the next higher settings, it grows noticeably stronger. I only ran through speed settings of 0 to 4, because at 4, I figured I was getting to "you're gonna hear this" territory and decided not try any higher settings. I would not record with air flow noise. But I did step though the rest of the settings, because the fan controller only increases the speed (no going down, only up) until the step after 10, which is off, so I got hear and feel those levels even though I was not interested in measuring them. A pair of these fans will clear the space pretty easily. THE FUTURE: AFTER THE INSTALL, and LONGEVITY I plan to return and update this first-look review with genuinely measured results once the booth is complete. That will likely be another few months because... life, family, and holidays. And if anything fails (controller, fans, whatever) I'll update this then, too.

I have 4 of these now and have been very happy with them. They are dependable and quiet for my needs. Best feature is that it remembers the speed setting while powered off. Only request is to add ability to decrease speed directly without cycling through the speeds

The AC Infinity cloudline pro S6 is an excellent and powerful inline duct fan. I bought this to vent the smoke and fumes from my laser cutter setup while cutting and running long vector engraves. It clears the machine perfectly and my workshop's air is virtually odor free. It runs quietly right next to my crafting station so I’m able to comfortably cut vinyl on my Cricut while keeping an eye on my laser. I highly recommend this fan for any laser engraving/3D printing workspace.

Works but I still have a slight smoke smell when I use this. I do like that it is quieter than my previous fan. Just wish it pulled fumes out better than it does. Very easy in install.

I have to admit, when I was shopping for a power fan to vent my xTool P2 laser engraver, I was a little worried about power (would this fan give me enough?) and loudness levels (would it be too loud?) and I have to say, it's perfect on all accounts. My system is probably just as complex as you'd guess: xTool P2 Laser, connected to a xTool filtration system, and then vented outside. That's three ducts (printer to filter, filter to fan, fan to outside) at 4", and the P2 itself is natively 3", but I bought an adapter on-line to make it 4". So overall, the fan works great, like wow! You can still hear it - it's not super quiet, but it's also not annoying. It's more of a louder "whoosh" than an annoying whine, if that makes any sense? And that's me running this fan at full-power, which is basically where I'm going to keep it at. It's possible that your needs won't be 100% all the time, and it is absolutely quieter at the slower speeds. The duct connections are perfect, and the 6" to 4" adapters I purchased here on Amazon were absolutely flawless and leak-free. As someone who buys a lot of high-end computer components, one of the things I really appreciated about all of the AC Infinity products (three ducts and this fan) is that it's well packaged, with a lot of accessories. It's almost like opening an iPhone, if iPhones came in dark packaging. It's also clear what this fan was designed for, as it came with a "how to grow hemp" manual, which made me laugh. There's a nice YouTube video on-line that explains how to set this all up specifically with the P2 (with details on the 4" to 6" leak-free custom adapters), and he tells you to get this model, and not the one that has all the bells and whistles (Bluetooth, WiFi, garbage disposal, toothbrush). I'm glad I got this exact model (S6 PRO). The remote is cool, and comes with a nice LONG (9') cable so you can put this wherever you want. You press the button once to turn it on, and it remembers the last settings (1-10) if you hold the power button for four seconds to turn it off. It's pretty cool! I love the design, and the fact that you can remove the center blower, to install the bracket on the wall, and then put the blower back in. Solid build quality. Overall, I'm very happy with this blower fan, and would absolutely recommend it for hydroponics and exhaust systems.

Working well as an exhaust fan for my 3d printer and laser workbench. The PWM control looks like it will be able to be driven from the printer which is good. Quiet and effective.

Funktioniert gut! Nach einem halben Jahr war der Drehzahlregler defekt. Innerhalb von 4 Tagen wurde vom Kundenservice ein neuer geliefert ! Freundlicher und guter Kundenservice.

Parfaitement emballé avec emballage d'origine et la prise est EU donc aucun soucis Livraison rapide sauf la gaine qui va mettre 8jrs plus que tout le matos

The brand is one of the better manufacturers selling to the general public and the vendor was very supportive and provided prompt service. I would buy from them again and recommend the inline fan without hesitation. It’s quiet at lower settings and works without issue.

Very powerful extractor. Used to externally duct a xTool P2S laser cutter. More powerful than the standard internal extractor and much quieter. Good upgrade.

Es la mejor compra que hice en los últimos años. Funciona excelente, una calidad increíble. Viene con todo tipo de cables y detalles para conectarlo. Una pasada la verdad