14"W X 12"H [Duct Opening] 3-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 15.75"W X 13.75"H] Aluminum - Cube Core + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 10"w X 14"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 38 5/8" width X 18 5/8" height -

these heavy-duty louvers are ideal for use in attics

+ Product Details Size – 14"w X 36"h is the size for the duct opening measurement only

transparent appearance

14"W X 12"H [Duct Opening] 3 Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 15.75"W X 13.75"H] Aluminum Cube Core + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 10"w X 14"h is the size for the duct opening measurement only actual front end outer dimensions are approximately 38 5 8" width X 18 5 8" height