iPower 20.6 X 20.8 Inch Shutter Exhaust Fan Aluminum, High Speed 1190 RPM, 3368 CFM, 1-Pack, Silver

Works wonderful in our barn. It is very powerful! You can feel it move the air. It is also quiet.

Originally bought a 14" exhaust fan. Simply was not big enough for 10 x 12 harbor freight greenhouse. I bought the 20.6 x 20.8 inch shutter exhaust fan not certain it would fit. It just fit between the aluminum framing on our 10 x 12 harbor freight greenhouse. I actually like how it fits. I used some left over 1" aluminum angle stock and stainless-steel bolts to attach it. Also used silicon to seal around it. Very sturdy installation. Greenhouse is reinforced with 2x4's and 4x4's. Not sure I would install this fan without some type of reinforcement. With 50% shade cloth, this fan was able to keep the greenhouse below 100 deg F during hot days of Michigan summer. We bought the temperature controller separate. As other reviewers have indicated, the plastic coating on the louvers is pretty much permanent. I would not recommend attempting to remove it. The coating does not affect function and the blue color doesn't bother me a bit.

It came in yesterday, ad I got right to it. Install was easy enough. It works just fine and moves a lot of air. The blue film on the louvers was difficult to remove and resulted in bending some of them. Otherwise, it would have been 5 stars.

Replaced a older fan that just died. This one is much quieter than the one that it replaced. As others said the cord is too short and will need to be lengthened, I recommend 14ga wire to do this. Also may want to consider a automatic switch as I may add one at some point.

Reasonably quiete fan moves a lot of air. Comes with aluminum weatherproof shutter to keep insects out when fan is not running (they don’t stand a chance when fan is running). We installed in office over commercial kitchen that shares the space with condenser units for refrigeration.