Our Vent-Axia exhaust system offers approx. 12oo CFM exhaust and intake capabilities. The system comes with a cut out in a polycarbonate panel which is installed at the time of the systems assembly. The fan is then assembled in the 12" custom made hole and the hardware with the three speed control is left for a licensed electrician to install. This fan assists in exhausting excessive heat, odors and humidity plus moisture but it do not expect it to resolve all over heating and moisture issues. It's a tremendous optional benefit and with one on each end and with the two systems working together with one pulling in and the other exhausting the benefits do increase considerably.