10" x 4" Adjustable Blade Sidewall Ceiling Register Vent Cover Diffuser Heavy Duty Stamped Steel (Listed Size is for Duct Opening or Inside Measurement) Actual outside measurement is 16"

Actual outside measurement is 16" x 8"

buy a 20x14 grille

and lay-in ceilings

Actual outside measurement is 14" x 6"

10" x 4" Adjustable Blade Sidewall Ceiling Register Vent Cover Diffuser Heavy Duty Stamped Steel (Listed Size is for Duct Opening or Inside Measurement) Actual outside measurement is 16"First thing to know about size selection: take the vent cover off the wall or ceiling. Measure the duct opening where the vent can fit in. Use the measurement to determine right size to buy. This product has listed size 10w X 4h is for duct opening measurement only, actual outsize overall dimensions is 12 wide by 6 high. If your duct opening size is 10 x 4, this is the right size and will fit in well. If you measure outside or surface size, you will