26"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 21.75"h] Supply Grille 75" Width X 33 Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

75" Width X 33

+ Product Details Size - 22"w X 22"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are 19" Width X 13" Height

+ Product Details Size - 22"w X 14"h X 2"d (for duct opening measurement only)

+ Product Details Size – 30"w X 12"h is the size for the duct opening measurement only

26"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 27.75"w x 21.75"h] Supply Grille 75" Width X 33 Compatible With Duct 7in Applications This sheet metal DDAG A 1212 75" Width X 33 + Product Details Size 22"w X 22"h X 2"d (for duct opening measurement only)