20"W X 25"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 21.875"W X 26.875"H] w14h14 ID tubing with 16 mm Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

ID tubing with 16 mm or 18 mm connections

+ Product Details Size - 34"w X 16"h is the size for the duct opening measurement only

75" width X 23

+ Product Details Size - 28"w X 10"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are approximately 26 5/8" width X 32 5/8" height

20"W X 25"H [Duct Opening] ALUMINUM RETURN GRILLE Easy Air Flow Linear Bar Grilles [Outer Dimensions: 21.875"W X 26.875"H] w14h14 ID tubing with 16 mm Compatible With Duct 7in Applications This sheet metal DDAG A 1212 ID tubing with 16 mm or 18 mm connections + Product Details Size 34"w X 16"h is the size for the duct opening measurement only