24"W X 16"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 25.875"W X 17.875"H] 14" Round Duct Pipe actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in

actual front end outer dimensions are approximately 33

Simply press until you hear that satisfying click

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 18" OR 18" x 20" duct opening (measured at the opening)

Plastic Frame

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 20" duct openings

24"W X 16"H [Duct Opening] ALUMINUM RETURN GRILLE Easy Air Flow Linear Bar Grilles [Outer Dimensions: 25.875"W X 17.875"H] 14" Round Duct Pipe actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in actual front end outer dimensions are approximately 33 Simply press until you hear that satisfying click