14" X 6" [Duct Opening] 3-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 15.75"W X 7.75"H] fixed bar + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 10"w X 24"h is the size for the duct opening measurement only

Actual Filter Size – 31 3/4"w x 25 3/4" x 1"

designed to optimize your air distribution

+ Product Details Size – 28"w X 26"h is the size for the duct opening measurement only

Actual Filter Size – 21 3/4"w x 19 3/4" x 1"

14" X 6" [Duct Opening] 3 Way Air Vent Adjustable Aluminum Curved Blades Integral Multi Shutter Damper HVAC Diffuser [Outer Dimensions: 15.75"W X 7.75"H] fixed bar + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 10"w X 24"h is the size for the duct opening measurement only Actual Filter Size – 31 3 4"w x 25 3 4" x 1"