For every 5x5 area one is required. Mounted this on a sailboat. Run a bead of caulk, done and done. The fan is constructed very well, it has a nice finish stainless steel finish on it.

Shed is free of musty, congested smell that can build up over time. Keeps the attic and studio cooler by 9° f. Comes with a spare fan to reverse the air flow.

Red bull gives me wings, chocolate covered pretzels and thicker eyebrows. More economical than other options.

Low quality solar cell, mounting puts it below surface, and glass blocks rays. Solution just use white extraction fan. Will not charge battery, only works when sun directly overhead. No mounting screws included with the product.

This is a totally misleading product description. It is not for an attic in a home. Dont waste your money on this trash product. Nt help at all.

It pains me to see that some people have cut holes into their sheds or vans for this fan. It does not seem to move very much air at all, the coop is 32 square feet and the fan makes no discernible difference in temperature.