18"w X 32"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 33.75"h] sidewall + Product Details Size –

+ Product Details Size – 8" x 28" or 28" x 8" is the size for the duct opening measurement only

Actual Filter Size – 11 3/4"w x 27 3/4" x 1"

Seamless Installation: Designed to fit seamlessly into a 24 by 24 inch opening

+ Product Details Size - 16"w X 10"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 16 5/8" width X 26 5/8" height

18"w X 32"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 33.75"h] sidewall + Product Details Size –+ Product Details Size 18"w X 32"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 19. 75" Width X 33. 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