AC InfinityCLOUDLINE PRO T8, Quiet 8” Inline Duct Fan with Temperature Humidity VPD Controller, WiFi Integrated App Control - Ventilation Exhaust Fan for Heating Cooling, Grow Tents, Hydroponics

This is easily the best company I have ever worked with as far as customer service goes. Their product is excellent. Their customer service is even better.

This product is made of three sections - the fan in the center, and the duct adapters on the left and right - that are connected to each other with screw-tightened straps. All the wiring is in the center section, while the left and right sections are connected to the metal "base". This arrangement provides a few features not mentioned in the product description:- The center (with the box on the side) can be rotated to fit better in tight joist bays- The center can be removed to screw the base into a joist- The center can be replaced (if it ever fails) without having to take ducts downAdditionally, the box on the side simply contains a terminal block where the power and control wires are connected. It is easy to hardwire the fan by replacing the power cord with 14/2 romex in that box. And the control, despite using a USB-C cable, is really just a 4-wire connection with PWM control, so the controller is readily replaced with a homegrown solution if desired (though with WiFi it also has an accessible API, so there is little reason to replace it).The fan is incredibly powerful. It's hard to imagine a use case that needs this much airflow. I would only ever use it on the lowest speeds.Mine makes an audible clicking noise when spinning, but it gets drowned out by the *whoosh* at higher speeds. Installed in a wall, the clicking noise probably wouldn't be audible at all.

This is an excellent fan. I purchased it to be used as a window fan. Most window fans for the most part are wimpy in comparison to this monster. This will give you wind output from a calm breeze to near hurricane force. The volume level is not what is stated at 39 db. At a distance of 3 feet I measured the decibels at 75db on the highest setting of 10. That said, this was with no ducting attached attached. With ducting attached it dropped to 70db. I will likely be using the fan in the neighborhood of 4, which drops the sound level to about 57db. In my NYC apartment the ambient level clocks out a 54db just 3 db less. So in this respect the sound is very quiet from the fan. Another interesting factoid about this fan compared to others is that it has a plastic body as opposed to metal. Normally, I would say metal is better, however the quality of plastic is excellent and it is definitely quieter than the metal housing duct and ventilation fans that I have heard. I think because the plastic amplifies sound less than metal fan housings. It's also quite efficient, although if you run it on 10 you're going to be pushing about 150+ watts, again higher than specs, but it is quite forceful if you need this kind of output. I will likely never take it above 7 which is in the neighborhood of 75 watts. To keep the fan dry I created a plywood hood covered with plexiglass, angle brackets and silicone. It fits in my window with a hole cut out for the fan to fit through. I engineered the roof of the hood at 45% slope to keep water and snow from collecting, and I added screening from home depot for the intake below to keep insects out. In this respect I can use it all year, although it's doubtful I will in the heat of summer. I also love the fact that it has bluetooth operations from my phone, and they actually have real people in their customer service department that are quite helpful. Recommended for the best possible window fan, provided you are handy with creating a hood. Also, likely very good if you are a grower or want it to move air from one area of your home to another.

I have this set up as an exhaust fan for my bedroom to create a nice cross breeze at night (same idea as a whole house fan without enough attic venting for a bigger fan). I have to max this fan out at level 5 based on the cfm to free netting in my attic (as it's connected from the room through ducting to the fan hanging from the rafters in the attic. It's the same noise level as my white noise machine at level 4 (I do have 2 90s in the ducting to cut noise) and moves a good amount of air.The temperature controller is fantastic! I set the temp I want the fan to cool the room down to and then have it set to step up/down in speed for each degree as it approaches the set point, so it will gradually work its way down to the temp I want and keep it there, usually at level 1 if it's just maintaining.I do wish the thermostat did some smoothing as the fan will change speeds every second or two as the thermometer updates, there needs to be some sort of averaging over at least a minute or two or more - maybe they can push a software update?

I was having issues with one room in the house either being hot or cold, depending on the season. This device has fixed that problem. I installed it a few weeks ago and it is working great. The room is now one of the colder rooms in the house. If you are installing in the attic, like I did, make sure you go with the T series. The T series has a lot more automation and there's an app for it as well. No need to go up into the attic to change settings. HVAC guy wanted almost $2k to fix the problem. I am giving this 5 stars. Not just because of the device itself but for the great customer service I have received. The programing can be a little confusing. I had to called customer service twice. They walked me through how to program the device, just the way I wanted it. They were very helpful.