12" x 8" Adjustable Blade Sidewall Ceiling Register Vent Cover Diffuser Heavy Duty Stamped Steel (Listed Size is for Duct Opening or Inside Measurement) just name a few

just name a few

Outside overall dimension is 16”wide and 10”high

and long-term performance

Select the listed size that match the duct opening size

high resistance to abrasion and chemical

12" x 8" Adjustable Blade Sidewall Ceiling Register Vent Cover Diffuser Heavy Duty Stamped Steel (Listed Size is for Duct Opening or Inside Measurement) just name a fewFirst 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