The QuFresh MC704 fan is ideal for anywhere with a need for powerful quiet ventilation. Coverage from 65 to 85 sq ft and can be mounted in a side wall installation. The fan is constructed with a galvanized steel housing and 4" diameter discharge collar. The blower unit is removable with a permanently lubricated, plug-in motor. Air delivery and sound levels are certified by HVI at the levels listed for this model and the unit is UL listed.