16" X 36" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 18 5/8" X 38 5/8"] w6h6 + Product Details Size – 4" Round Duct Pipe Product Details Size The SHEASC10W1-HP

+ Product Details Size – 10" x 10" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 42 5/8" width X 22 5/8" height -

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

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

16" X 36" Steel Return Air Filter Grille for 1" Filter Fixed Hinged [Outer Dimensions: 18 5 8" X 38 5 8"] w6h6 + Product Details Size – 4" Round Duct Pipe Product Details Size The SHEASC10W1 HP + Product Details Size – 10" x 10" is the size for the duct opening measurement only actual front end outer dimensions are approximately 42 5 8" width X 22 5 8" height