I use (4) 4" duct fans to provide ventilation under a utility shed that is closed in around the perimeter to keep squirrels, chipmunks, etc from taking up residence underneath it. I found that closing it in around the perimeter caused moisture and thus mold to form there. I installed 4 metal grilles on one side and 4 of these fans on the other. Time will tell how much life I get from these little fans ......but they are inexpensive and I've installed them so they can be quickly and easily replaced when they wear out.
Verified purchase: Yes | Condition: New
the fan works perfectly everything is great. The only minor flaw is that the ends are very sharp and tore my hands to pieces when I was installing it.
Verified purchase: Yes | Condition: New
disappointed in fan thought it would move more air
Verified purchase: Yes | Condition: New
a bit noisier than expected but other works well
Verified purchase: Yes | Condition: New
great for a small spaces and combined with a filter this fan will keep the fresh air flowing.
Verified purchase: Yes | Condition: New
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