This variable speed shutter-mounted exhaust fan features three aluminum blades, an enclosed air-over PSC motor, a chrome-plated aluminum frame, and a chrome-plated steel guard. It measures 16 3/4 x 16 3/4 inches, has a blade diameter of 12 inches, and a maximum depth of 12 inches. This 50 Hz exhaust fan has a voltage of 115/230 VAC, a motor RPM of 1700, and a maximum ambient temperature of 104 Degrees F. It has auto thermal protection, class B motor insulation, and includes a shutter.