22" X 16" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 24 5/8" X 18 5/8"] w25h25 display = 'none'

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+ Product Details Size - The listed 4" diameter refers specifically to the size of the duct opening

4" X 14" Brass Victorian Floor Register Grille - Modern Contempo Decorative Grate - HVAC Vent Duct Cover - Brass Plated

+ Product Details Size - 6"w X 20"h is the size for the duct opening measurement only

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22" X 16" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 24 5/8" X 18 5/8"] w25h25 display = 'none'+ Product Details Size 22"w X 16"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 24 5 8" width X 18 5 8" height Actual Filter Size 21 3 4"w x 15 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.