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It has built-in damper to control air flow
Actual outside measurement is 14" x 10"
Difference between "inside" and "outside": Inside (duct opening) is the measurement you can see after taking the vent off the wall or ceiling
Efficient Airflow: With a 10" x 8" duct opening size
The Listed size 18"x12" is for inside duct opening measurement
10" x 8" Adjustable Blade Sidewall Ceiling Register Vent Cover Diffuser Heavy Duty Stamped Steel (Listed Size is for Duct Opening or Inside Measurement) It has built-in damper toFirst 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 10w X 8h is for duct opening measurement only, actual outsize overall dimensions is 12 wide by 10 high. If your duct opening size is 10 x 8, this is the right size and will fit in well. If you measure outside or surface size, you will
