28"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 7.75"h] 18" Round Duct Pipe polished brass

polished brass

+ Product Details Size - 20"w X 32"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are approximately 20 5/8" width X 38 5/8" height -

actual front end outer dimensions are approximately 38 5/8" width X 20 5/8" height -

+ Product Details Size - 26"w X 18"h is the size for the duct opening measurement only

28"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 7.75"h] 18" Round Duct Pipe polished brass+ Product Details Size 28"w X 6"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 29. 75" Width X 7. 75" Height Weather and Pest Proof These louvers are especially designed to prevent water from entering your home, and with a built in back 1 2" mesh they also protect you from annoying rodents like mice, rats, birds, and squirrels High Quality Aluminum The premium durable aluminum will never rust and it will never wear