25"W X 16"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 26.875"W X 17.875"H] 18" Round Duct Pipe Actual Filter Size – 21 CRFG2028 Width_14in 4 X 12 Is

Actual Filter Size – 21 3/4"w x 7 3/4" x 1"

+ Product Details Size – 28"w X 22"h is the size for the duct opening measurement only

purposes with tumbler lock & key (2 keys included) and can be installed on drywall

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+ Product Details Size - 26"w X 18"h X 2"d (for duct opening measurement only)

25"W X 16"H [Duct Opening] ALUMINUM RETURN GRILLE Easy Air Flow Linear Bar Grilles [Outer Dimensions: 26.875"W X 17.875"H] 18" Round Duct Pipe Actual Filter Size – 21 CRFG2028 Width_14in 4 X 12 Is Actual Filter Size – 21 3 4"w x 7 3 4" x 1" + Product Details Size – 28"w X 22"h is the size for the duct opening measurement only