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+ Product Details Size - 25"w X 26"h is the size for the duct opening measurement only
+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 36" OR 36" x 30" duct opening (measured at the opening)
+ Product Details Size – 12" X 2" is the size for the duct opening (floor/vent hole) measurement only
Actual Filter Size – 19 3/4"w x 15 3/4" x 1"
+ Product Details Size – 36"w X 20"h is the size for the duct opening measurement only
18" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14" Diameter + Product Details Size Product Details Size 30 LO1828 12in diameter + Product Details Size 25"w X 26"h is the size for the duct opening measurement only + Product Details Perfect Fit & Easy Sizing Designed for a 30" x 36" OR 36" x 30" duct opening (measured at the opening)
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