Proseles PS3WW Steel Register can be used in Residential and Light Commercial applications and easily installs in either a sidewall or ceiling. Ideal for shallow duct installations, it is constructed of steel, and features a multi-shutter valve. This Sidewall Register and Ceiling Register uses a three-way deflection, and the interlocking valve louvers allow for positive shut-off. Featuring a bright white finish, the steel register is designed and manufactured to the highest performance standards, while delivering exceptional value, aesthetic appeal, and consistent performance. The dimensions listed refer to the area of the diffuser that sits recessed inside of your wall, and for more dimensional information please see the additional drawing images above.