12 IN.H 12 IN.W DRNBL EXTRD ALU INTAKE LOUVER, LOUVER TYPE STATIONARY BLADE, FRAME TYPE HAT CHANNEL, FRAME DEPTH 4 IN, MOUNTING STYLE RECESS MOUNT, OUTSIDE HEIGHT 11 1/2 IN, OUTSIDE WIDTH 11 1/2 IN, ROUGH OPENING HEIGHT 12 IN, ROUGH OPENING WIDTH 12 IN, LOUVER MAXIMUM INTAKE 144 CFM, MAXIMUM EXHAUST 188 CFM, MAXIMUM OUTSIDE WIDTH 11 1/2 IN, MINIMUM OUTSIDE WIDTH 11 1/2 IN, FLANGE WIDTH NOT APPLICABLE, FREE AREA 0.4 SQ FT, BEGINNING POINT OF WATER