8" x 8" Adjustable Blade Sidewall Ceiling Register Vent Cover Diffuser Heavy Duty Stamped Steel (Listed Size is for Duct Opening or Inside Measurement) This product has listed size

This product has listed size 10“w X 8”h is for duct opening measurement only

Adjustable blade allows all horizontal direction air deflection

The Listed size 10'' X 10'' is for inside duct opening measurement

The Listed size 12"x 4" is for inside duct opening measurement

75" with screw holes distance between 10

8" x 8" Adjustable Blade Sidewall Ceiling Register Vent Cover Diffuser Heavy Duty Stamped Steel (Listed Size is for Duct Opening or Inside Measurement) This product has listed sizeFirst 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 8w X 8h is for duct opening measurement only, actual outsize overall dimensions is 10 wide by 10 high. If your duct opening size is 8 x 8, this is the right size and will fit in well. If you measure outside or surface size, you will