4"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 5.25"W x 5.25"H] Return + Product Details Size & 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size & Compatibility – The size of sheet metal pipe is 6" round x 24" long

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

+ Product Details Size - 30"w X 8"h Is The Size For The Duct Opening Measurement Only

actual front end outer dimensions are approximately 18 5/8" width X 36 5/8" height

+ Product Details Size – 24" x 30" or 30" x 24" is the size for the duct opening measurement only

4"W X 4"H [Duct Opening] Linear Aluminum Clip On Bar Return Air Grille [Outer Dimensions: 5.25"W x 5.25"H] Return + Product Details Size & 4 X 12 Is CRFG2028 Width_14in + Product Details Size & Compatibility – The size of sheet metal pipe is 6" round x 24" long + Product Details Size – 10"w X 14"h or 14" x 10" is the size for the duct opening measurement only