8"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 37.75"h] 14in diameter + Product Details Size - Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size - 16"w X 14"h X 2"d (for duct opening measurement only)

75"H – fits a 20" X 6" duct opening

actual front end outer dimensions are 25" Width X 25" Height

actual front end outer dimensions are approximately 30 5/8" width X 36 5/8" height

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

8"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 9.75"w x 37.75"h] 14in diameter + Product Details Size Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size 16"w X 14"h X 2"d (for duct opening measurement only) 75"H – fits a 20" X 6" duct opening