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.

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.

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..

Excellent quality, high air flow, and relativly quiet. Dramatically reduced humidiity level in crawl space on day one.

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

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 fan effectively exhausts radon gas, wood gases, and other odors from my crawl space, keeping my living spaces fresh.

I like it. Priced a bit high but works well. I use two of them in my crawl space. I hang them with bungee cords to isolate vibration noise. Moves an adequate volume of air. I recommend the product.