Special Features:

Safety disconnect switch and bird screen furnished as standard accessories, unit designed for variable speed operation when used w/solid state control switch, 50 per cent reduction rpm and cfm possible

Properties:

A nonpositive displacement mechanical device having either an axial or centrifugal fan impeller. It is designed to move free air or gas from indoors to outdoors or vice versa over a wide range of volumes at low pressures. It is supported by a ring, plate, or shroud or may be inclosed in a housing. It is designed for installation in a window, roof or wall opening, or the like.