Quiet ceiling ventilation fan. This fan is one of the quietest available. It provides ventilation to rooms up to 375 square feet in size, including residential and commercial locations. The housing is made of cold-rolled steel, and the cover is smooth and rounded and projects less than one inch from the ceiling. The grille is held in place by a spring, allowing for easy installation and access. Also included are pre-wired outlet boxes with plug-in receptacles and adjustable hanger brackets which provide mounting between 16-inch on-center joists. Not for use in kitchens. Nutone is North America"s largest producer of residential ventilation products.