HVAC Premium 18"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 19.75"h] w32h32 + Product Details Size –

+ Product Details Size – 8"w X 28"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 14 5/8" width X 10 5/8" height

+ Product Details Size - 6"w X 6"h X 2"d (for duct opening measurement only)

+ Product Details Size – 14" x 30" or 30" x 14" is the size for the duct opening measurement only

HVAC Premium 18"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 19.75"h] w32h32 + Product Details Size –+ Product Details Size 18"w X 18"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 19. 75" Width X 19. 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