Whisper Features Overview: Installation Ceiling ONLY Hole Size 285mm Required Install Depth Requires 335mmof cavity space Extraction Rate 750 m3/hr Noise 52 dB(A) Motor Wattage 35w Ductable No High capacity non-ductable ceiling exhaust fan that features a backdraft shutter to prevent cold air coming back into the bathroom when the fan is not in operation; and easy installation clamps making it incredibly easy to install.
