28"W X 8"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 29.875"W X 9.875"H] 18" Round Duct Pipe Location – sidewall and ceiling Height_16in RG1612AL Product Details Size 14

Location – sidewall and ceiling

+ Product Details Size - 30"w X 40"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 22" x 10" OR 10" x 22" duct opening (measured at the opening)

Effortless Integration: Crafted for easy connection to supply grilles of drop ceiling T-Bar vent covers

Powder-Coat Finish – smooth

28"W X 8"H [Duct Opening] ALUMINUM RETURN GRILLE Easy Air Flow Linear Bar Grilles [Outer Dimensions: 29.875"W X 9.875"H] 18" Round Duct Pipe Location – sidewall and ceiling Height_16in RG1612AL Product Details Size 14 Location – sidewall and ceiling + Product Details Size 30"w X 40"h is the size for the duct opening measurement only