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+ Product Details Size - 20"w X 4"h is the size for the duct opening measurement only
9% Pure Copper meeting ASTM B280 standards
no exceptions
Actual Filter Size – 29 3/4"w x 29 3/4" x 1"
+ Product Description This aluminum flex duct is intended to be used in heating
24" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - Black - [Outer Dimensions: 26 5/8" X 22 5/8"] Return Grille + Product Details Size -+ Product Details Size 24"w X 20"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 26 5 8" width X 22 5 8" height Actual Filter Size 23 3 4"w x 19 3 4" x 1" High Quality High quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Installation Location Sidewall and ceiling Design Removable door face for easy filter change & cleaning uses a 1" thick filter.
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