12" x 8" Adjustable Blade Sidewall Ceiling Register Vent Cover Diffuser Heavy Duty Stamped Steel (Listed Size is for Duct Opening or Inside Measurement) Multi-shutter damper with easy handle

Multi-shutter damper with easy handle to adjust desired amount of air flow

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Outside overall dimension is 16”wide and 10”high

standard 3/4" 90 degree elbow FHT(Female Hose Threaded) or FGH(Female Garden Hose) connector fittings

Select the listed size that match the duct opening size

12" x 8" Adjustable Blade Sidewall Ceiling Register Vent Cover Diffuser Heavy Duty Stamped Steel (Listed Size is for Duct Opening or Inside Measurement) Multi-shutter damper with easy handleFirst 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