16" X 10" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 18 5/8" X 12 5/8"] w18h18 + Product Details Size - Insulation Black Foam Tape Sheet Metal/Adjustable Elbow CRG1234

+ Product Details Size - 36"w X 10"h is the size for the duct opening measurement only

+ Product Details Size - 16"w X 14"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 26 5/8" width X 38 5/8" height -

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16" X 10" Steel Return Air Filter Grille for 1" Filter Fixed Hinged [Outer Dimensions: 18 5 8" X 12 5 8"] w18h18 + Product Details Size Insulation Black Foam Tape Sheet Metal Adjustable Elbow CRG1234 + Product Details Size 36"w X 10"h is the size for the duct opening measurement only + Product Details Size 16"w X 14"h is the size for the duct opening measurement only