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The Listed size 12"x12" is for inside duct opening measurement
actual outsize overall dimensions is 14'' X 14''
This product has listed size 8''X 8'' is for duct opening measurement only
This product has listed size 14“w X 8”h is for duct opening measurement only
8" x 6" Adjustable Blade Sidewall Ceiling Register Vent Cover Diffuser Heavy Duty Stamped Steel (Outside Dimension 10" x 8") The Listed size 12"x12" isFirst 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 6h is for duct opening measurement only, actual outsize overall dimensions is 10 wide by 8 high. If your duct opening size is 8 x 6, this is the right size and will fit in well. If you measure outside or surface size, you will get