16" X 22" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 18 5/8" X 24 5/8"] 8" Diameter + Product Details Size - Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size - 4"w X 16"h is the size for the duct opening measurement only

is fireproof and ensures efficient thermal performance

+ Product Details Size - 34"w X 34"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 18 5/8" width X 20 5/8" height

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16" X 22" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 18 5 8" X 24 5 8"] 8" Diameter + Product Details Size Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size 4"w X 16"h is the size for the duct opening measurement only is fireproof and ensures efficient thermal performance