12" x 8" 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 14"

Actual outside measurement is 14" x 12"

15" long heavy duty steel construction with oil brushed powder coating finish

Do not use outside measurement for size selection or it would be too bit to fit

and long-term durability

The Listed size 14"x20" is for inside duct opening measurement

12" x 8" 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 14"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 12w X 8h is for duct opening measurement only, actual outsize overall dimensions is 14 wide by 10 high. If your duct opening size is 12 x 8, this is the right size and will fit in well. If you measure outside or surface size, you will