AC Infinity CLOUDLINE S12 PRO, Quiet 12” Inline Duct Fan with 10-Speed Controller, EC-Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics

I bought this to replace an existing failed 12" inline boost fan for a home ventilation system. I'm going to be quite critical because I'm comparing against another EC fan. A summary of my review is that I think this is quite a lazily designed product to be demanding such a high price (£350). More professional options are not that much more expensive, but offer far greater quality. This seems to be an example of a compact EC motor being slapped into a shell designed for a bulky AC motor. The benefits of a smaller, energy-efficient motor are not taken advantage of. First off, it does work and sort of meets some of the basic claims. It can be controlled by PWM - if you replace the silly USB-C cord (I take personal offence to this inappropriately used connector for 10-volt PWM signals). I connected this up to a Shelly for WiFi speed control. It does move a lot of air at the top speed and can be slowed down to a very quiet level. The next thing anyone will note is how loud it is. The volume at full-speed is expected, and it can run very quietly at low RPMs. However, everything in-between is kind of closer to the louder-end of what I hope and expected. While installing, I found the 12" diameter to be a bit of a loose claim (heh). This doesn't follow the normal conventions expected from other 12" ducting products. Specifically, the outer diameter of the inlet/outlet is 300mm rather than the usual 312-315mm, this means that existing 12" ducting was more than just very loose. It's a good thing that I decided to replace the mains cord, because it seemed the cable grip had badly crushed the cord. These sorts of fans are always marketed for hydroponics (hmm...), but one thing I noticed quite taking a closer look was the general lack of sealing. If it does meet IP44 specs, it does it very barely. I don't expect this to survive much condensing humidity.

Quiet, powerful exhaust fan. Using it for a whole house circulation. The remote can be interfaced with a microcontroller generating a pwm signal, for extremely powerful and customized control.

This is my second one of these (12"). Not because the first one broke but because I had an additional project. They are relatively quiet and push a lot of air. One has been running an exhaust for my metal shop for over 3 years and still works flawlessly. The second is running a DIY air cleaning system that I put in my woodshop -- barely hear it in the attic and, again, pushes a ton of air. Recommend.

Fine

This this BLOWS! Holy sheet, its insane on max. Big boy cfm's. Really happy both worked out of the box.