AC Infinity CLOUDLINE S8 PRO, Quiet 8” Inline Duct Fan with 10-Speed Controller, EC-Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics

The AC Infinity CLOUDLINE S8 PRO has been a total game changer for venting my miner room. The 8” inline duct fan moves a huge amount of air while still being surprisingly quiet thanks to the EC motor. The 10-speed controller makes it easy to fine-tune airflow depending on the temperature load, and I’ve noticed a big difference in keeping my miners cool and stable. Build quality is excellent — sturdy housing, smooth fan operation, and the controller feels responsive and reliable. Installation was straightforward with the included hardware, and once running, it just works flawlessly. ✅ Pros: Moves a lot of air with quiet operation 10-speed controller allows for precise airflow control Solid build quality, built to last EC motor is energy-efficient and quiet Perfect for grow tents, server rooms, or mining setups ❌ Cons: Higher price point than basic fans (but worth it for performance and reliability) Ducting not included, so you’ll need to purchase separately 💡 Tips: Pair it with insulated ducting to reduce noise further. Position exhaust outside or into a larger ventilated area to prevent recirculating hot air. Use a temperature/humidity controller with it for fully automated cooling. Mount with rubber isolators if possible to cut down on vibration. Bottom Line: This fan is a must-have for serious ventilation needs. If you’re running miners, servers, or even grow tents, the S8 PRO is a reliable, efficient, and quiet way to keep heat under control. Well worth the investment.

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.

This fan is seriously solid. The AC Infinity CLOUDLINE S8 PRO is super quiet for how powerful it is, and the airflow is no joke—it moves a lot of air without sounding like a jet engine. The 10-speed controller is easy to dial in, and it’s nice having that fine control. Build quality feels premium and it just runs smooth and reliable. Definitely overkill for small setups, but perfect if you need strong, efficient ventilation that you can trust long-term.

I have been amazed with this product. And I have been wanting to write a detailed review to highlight the quality of this product, but also to highlight that HVAC booster fans can work despite the negativity found online from the HVAC industry. First of all the quality of these fans is amazing. Very high quality construction and for their size they are remarkably quiet. I am not sure how the manufacturer rates the sounds levels, but at their highest fans speeds they are quit noisy, but for an HVAC booster application you will only need the lower fan speeds which are very quiet. Since my fans are mounted in the attic, the only added noise I hear in the house is the additional air flow coming through the ceiling registry/vent. As for airflow rates, this fan has some ridiculous flow capacity. Literally the first time I fired up the fan with it sitting on my wood flooring, at speed 8 the fan started traveling across the floor like a swamp boat. Now I will mention that if used in an HVAC application, you will need to properly insulate the fan housing to prevent condensation from forming on the exterior of the fan housing. I also questioned what the current load was for these fans and the manufacturer was not able to provide that information, so I took my own current readings. Below are the current loads at each fan speed for the 8" model: 1 - 0.08 amps 2 - 0.10 amps 3 - 0.18 amps 4 - 0.30 amps 5 - 0.48 amps 6 - 0.75 amps 7 - 1.12 amps 8 - 1.52 amps The reason I needed to know the current load for these fans is that in my application I wanted the booster fans to run only when the central HVAC blower was on. To accomplish this I installed a dedicated outlet that is switches on by a Vortex Power Fans AC Current Switch (or current operated solid state relay). The problem is this current switch is limited to handling 2.5 amps. My original plan was to run a relay for each fan, but since I was operating the fans at speeds 1-3 only, I was able to combine the fans on a single current switch. So at the end of the day why did I need these fans? Well my HVAC is poorly laid out with the unit located at one end of the house, so our master bedroom at the other end of the house has a 50-ft duct run, where most of the house is on duct runs less than 20-ft. The air flow loss due to the long duct run caused an average temperate difference of 2.5 degrees, with spikes of 5-6 degrees during the late afternoon sun, as documented by my Ecobee themostat and additional temperature sensors. Since installing the 2 booster fans that route air to our master bedroom, we have completely reversed the temperature difference, so that now our master bedroom averages about 0.5 degrees cooler than the main thermostat. So a full 3 degree temperature swing and that is with both fans running on the lowest speed (1). The reality is, I could have easily gotten away with installing only 1 fan, as I ran a single fan for several days at speed 3, and that was enough to balance our bedroom alone.

I liked the features of this fan, including the speed control. It's a superior design because it has rotor and stator blades inside the housing. This type of fan is quieter more efficient than a simple fan blade design. The housing on either end can be split from the center motorized fan module by removing a clamp. This allows for cleaning the fan or swapping out a bad motor. This design simplifies a booster fan repair because once duct joints are assembled, especially in an HVAC system, they are difficult take them apart. Just remember when you are disassembling the body from the motorized section, DO NOT loosen the clamps all the way. Leave about 1/4 in of thread exposed below the nut. Even though the clamp isn't disassembled it is loose enough to take the fan apart. It feels sort of like the pop you feel when changing a bicycle tire and you push the bead of the tire over the rim. My application for this Inline Duct Fan was for HVAC ducts. Two legs of my system were fairly long and ducts were undersized. Installation was fairly simple. The set of steel duct clamps provided in the kit came in handy. I added mastic tape around the joint and activated the adhesive with hand pressure. Once attached, it's hard to take apart so I took my time to make a good seal and a mechanically strong joint. I needed to suspend my fan, so think about the mounting method before you get started. You could also use the bracket attached to the housing. I powered the fan with a relay circuit that energizes the booster fan only when the main HVAC unit comes on. I watched a YouTube video of someone else solving this requirement. I bought the relay on Amazon: RIBU1C Pilot Relay. After I finished the electrical work, I used the fan unit's 8 speed settings to adjust airflow and balance the HVAC system. I balanced the HVAC airflow by varying the speed on the fans. I have installed fans on two long duct runs. At fan speed 8 (max), the unit gets noticeably noisy, but it's also pushing a lot of air. You might not need top speed. In my system, setting the fan speed at 2 or 3 balances the airflow. At this setting, the fan is very quiet and still pushes a lot of air. Airflow adjustments can be made with the speed controller. The rooms connected to the system are now much more comfortable, summer and winter.

It's good EC mixed flow fan that feels premium. I own the T6 fans and they consume 37-40w at max. I went with that in mind for the 8" fan and when I saw the specs mention 78w I was really impressed. However, on manufacturers website this is mentioned as Average power. The specs on the Fan itself says 180w which seems more in line with the actual figures. Power consumption: In reality, this was a disappointment in terms of power consumption. It consumes 169w at full speed. That's way more than what specs say. Airflow: Feels to be great. Moves a lot of air. Noise: Speeds 1-6 are okay. Speed mode 7 and 8 are quite loud. These modes significantly draw more power. Speed setting 6 to 8 increased the power consumption two times. Conclusion: Solid inline fan. Quality product. However, they can improve on the warranty of these. 2 years seems to be low compared to competitors ----------------------------------------------------------------------------------- Shootout: 3 duct fans compared. 8" duct fan shootout between Hon&Guan Inline Duct Fan (760 CFM, $125) vs TerraBloom ECMF-200 (710 CFM, $159) vs AC Infinity S8 (807 CFM, $169) Packaging, accessories & build quality. AC Infinity S8 > Terrabloom ECMF-200 >>> H&G 8" S8 came with a 8-speed controller. The duct fan housing itself has a metal bracket. Comes with the required screws/anchors. ECMF-200 also came with good bundle of accessories along with wiring to connect the duct fan without the speed controller. The housing is made of metal and build quality seems good. H&G looks cheap and the housing is made of plastic. The fan mounting mechanism is also plastic. Note: Impeller is plastic on all three. Power Cord length. Terrabloom > AC Infinity >>> H&G The power cord on S8 and ECMF-200 are of good length. The ECMF-200 has a thicker power cord. H&G on the other hand has a really short power cord. You'd need an extension if you're not mounting this near a power plug point. Speed Controller Terrabloom >= H&G > AC Infinity All 3 speed controllers have a fair length to them. The AC Infinity controller looks cooler but the button approach of fixed 8 speeds might not be best to tune for CFM between intake - outlet air pressure balance. The H&G and Terrabloom both have knob to control speed. Airflow & power consumption. AC Infinity >> Terrabloom >= H&G I tested all 3 duct fans with a 8' duct and without ducting. The terrabloom and H&G pushed approximately 6.5-7 m/s of air at max speed while the S8 did 8 m/s. S8 clearly pushes more air but also consumes more power. At max speed the power consumption is around 170w. The ECMF-200 was most efficient one with 80w peak power while the H&G sat at around 130w. Thing to be noted here is the S8 at speed 6 pushes similar amount of air like terrabloom ECMF-200 at 80w. So you've got the option to both run it efficienlty and with higher airflow on the S8. Noise: AC Infinity S8 makes more noise which isn't surprising at all. In fact all 3 fans would be quite noisy at max speeds. You'd need to utilize insulated ducting or noise reducers/dampers. Winner: AC Infinity S8 wins it among the 3. You can run it efficiently and push same amount of air as Terrabloom ECMF-200. Both of these fans outperform the H&G 8" fan. If Terrabloom ECMF-200 costs somewhere around $120-$130 it would've been a good alternative to AC Infinity S8. Unfortunately, when I bought it the S8 was just $10 more than ECMF-200.

I installed above my 42U home server cabinet (currently with 30U populated) to keep the equipment cooler. Before I just had a fan blowing onto the rack which kept it cool enough I didn’t need to worry about damaging equipment, but warm enough the fans were screaming (especially the 12x 1u servers and their power supplies). I added a 10x10 filtered intake and ducted into the A/C intake box with the fan inline. With the house temperature set to 75° And the fan on high, I read a temperature of 76.2° outside of the server cabinet, and a temperature of 77.0° at the intake vent directly above all of the equipment. I added some “plastic curtains” (like you’d see on a warehouse door) cut to length to meet with the top of the cabinet, which keeps the rack pretty well sealed off so air going to the vent must pass through the rack itself. I’ve also made sure to install rack blanks in any unpopulated slots. I can still fill in some small gaps (a couple of 1/2U spaces) which I know will help considerably still. Now the equipment is far quieter, and all systems are running considerably cooler. I ran the duct directly to the air return on the A/C unit because I do not want to create a vacuum in my house by venting directly into the attic as many people do with their equipment. The pressure difference will either cause air to be pulled back into the house from the attic (which is often 130°+ here in Vegas), or from outside (which is often 105°+ in the summer). This way it will continue to circulate the (slightly) warmer air throughout the house, which in turn will cause the A/C to kick on more often to maintain the temperature. It’s not perfect of course, but it’s better than creating one very hot spot in the house, or sucking much hotter air in through the attic/outside. As for noise, the fan is installed in the attic screwed directly to a rafter (no bungee cords or anything to dampen the noise/vibration). If the house is very quiet, I can hear a slight hum when I’m near that area. Slight enough I really have to pay attention and try to notice it. Slight enough I’m not even entirely sure I’m not just imagining it. This is with the fan on full speed also. Even turning it down a notch makes it considerably quieter. It’s definitely way quieter and a huge net positive from the db level decrease from my servers. Instillation could’ve been easier. The size of the fans duct was considerably smaller than the ducting itself, which made it tricky to get a good seal around it and fasten the flex duct down. Of course this was very much amplified by working in the cramped space in my attic. I’d like to see a more appropriately sized intake/outlet if they decide to redesign it, and the fact they didn’t spec it correctly is very odd considering the build quality seems to be good quality (as you’d expect given the price).

**Update** We leave our HVAC blower on 24/7 to keep air moving around the house. This fan here has been running 24/7 ever since it was turned on. It has never given any problems at all and still runs perfect. Zero complaints. I am actually thinking about purchasing another unit for the other section of the house now. I would buy 3 or 4 more but it would get expensive. We have a longer house with higher ceilings. The north side of the house was always about 5 to 8 degrees different. I purchased this and installed it on a long run to help push air. It pushes a lot of air! We only have it set about half way because it will blow the curtains all over the place. I wouldn't really call this quiet if you will be around the unit when its running on the top speed. You would find yourself talking over it a lot. Now the house seems to be equal temperature which is what I was going for. Installation was pretty simple. I cut out a section of 8" pipe and measured how much the fan body would use. I believe this model for me it came to about 9". I cut 9" off and reinstalled the end coming from the HVAC ducting and then mounted the fan body up, installed the guts and then finished by reconnecting the outlet ducting. I don't notice ANY vibration but I did mount the body with 4 screws tightly to the framing studs of the walls. The unit is down in the basement and nobody hears it running unless you are over by the air vents. Even then you don't hear the unit, you just hear moving air. Hopefully this thing lasts years. I am running it 24/7 like I do with our HVAC blower.

Bought it for a DIY Air Purifier, and it's extremely powerful on max settings. Looks good too, it's well made. I'd order from them again when I aim to get a humidifier.

Du bon matériel bien fini, avec prise française. Très puissant !

I ordered this unit to be able to recirculate the air within a room through a furnace type filter. I was positively impressed with the quality of this product. It looks nicely finished, simple and elegant. The wiring and the connections are of high quality and workmanship. It has a smooth acceleration, is vibration free, and quite. The speed controller and the temperature/humidity are nicely implemented, easily programable and very versatile. The temperature/humidity sensor is also well designed and easy attachable to any surface. The ability to add a second fan to the same controller is another nice feature. I am very satisfied with this product.

Absolut zu empfehlen sehr Leistungsstark und Qualitätiv hochwertig gebaut. Arbeitet zuverlässig mit den anderen ac Infinity Komponenten. Allgem lieber mehr Leistung als benötig einkalkulieren bei mir läuft das ganze auf Stufe 1-3 von 10 möglichen absolut leise im Betrieb auch ohne Schalldämpfer

Never something else then AC INFINITY