Hart & Cooley Ceiling Diffuser

Designed to fit a 12 hole, overall diameter is 15-15/16 Step down diffuser rings deflect air stream 360 degrees Bright White finish Sold Separately: Butterfly Damper For This Diffuser (12 Hart & Cooley #12) All-steel construction ORDERING NOTE: The Hart & Cooley 16 series 12 round ceiling diffuser is specifically made to cover a 12 hole in the ceiling. The overall outside diameter of the grille is: 15-15/16 (with three holes for mounting)