ALORAIR 540 CFM IP-55 Grade Crawlspace Ventilation Fans with Humidistat & Thermostat, 8.7 inches Basement Vent Fans with Isolation Mesh, Ventilator Fan for Crawl Space Basement Attic Garage, Exhaust

So far so good. I turned it on for a few minutes and went down from the attic. I could feel the cool air being drawn up the stairs. Waiting for the heat. That’s the real test. Strong little fan. I like it.

The media could not be loaded. Bought the 540 model, good price and 2 year warranty. Just note most homes have several vents to choose from, after plugging it in my garage to confirm it ran okay I decided to place it away from where we sat outside, it's not super loud but you can hear it running. So if you can place it away from any area with people. I've attached a short video to hear it running.One more thing we can hear it in the house but only in the room above the crawlspace vent where it's mounted.

This is a great fan and seems to work really well, however, it is not quiet. I installed it in one of my vents two rooms away from my bedroom and can hear it clearly. The benefits definitely offset the small annoyance. This would absolutely be five stars if it wasn’t for the sound level..

This is an excellent product. I set the humidistat to the lowest setting & the unit does the rest. It shuts off when moisture/humidity is low & restarts as soon as moisture in area increases.

Worked extremely well. Was very easy to install. Doesnt make a lot of noise at all.

This thing moves some air for sure but I put it in my crawl space and it's pretty annoying even from the main floor. I would like it better if there were a few lower speeds for when you just need to keep a little air moving.

This tiny fan can really move some air. I bought a house recently and the crawl space was perpetually wet in this north Texas humidity. I had to install a couple of French drains to divert water away from the house but still needed some sort of ventilation to pull the most air out of the crawl space. This assembly is quite a bit larger than the standard size vent opening on crawlspaces in this area but it will fit between floor joists spacing. I ended up having to mount mine to the exterior of the house then attached a piece of siding above it to divert water around the fan. The built in hygrometer is set to turn on at 70% relative humidity and I'm pretty sure it's only turned off 2 times when it was dry enough since 2 months ago when I installed. To alleviate sound and vibration I simply put rubber isolators between the assembly and mounting surface. That helped to reduce the sound to being heard only in the downstairs bathroom is mounted directly under. With this fan and a bag of damp rid the crawlspace dried out completely in around 48 hours

I've had it plugged in for a month and it stopped working