Broan Model 511 Room To Room Utility Fan. Housing adjusts to fit walls from 3" to 5-1/2" thick. 180 CFM. Interior use only. Not intended for ventilating moisture from bathroom. Easily installs in interior walls to move heated or cooled air from one room to another. Spreads heat from fireplaces, cool air from air conditioners to adjoining rooms. FEATURES GRILLE: . Two contemporary styled grilles complement modern decor . White polymeric grilles can be painted to match any decor MOTOR: . Permanently lubricated, thermally protected, plug-in motor . Motor assembly offers fast, easy "twist-lock" installation . Solid state speed control for fan speed and sound level selection HOUSING: . Requires 11-5/8" square hole through both interior walls . Housing can be fastened to walls in serveral ways - allows flexibility to meet almost any mounting situation . Adjustable housing fits walls from 3" to 5-+" thick . Housing 25 gage finished with rugged black electrically-bonde