20"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 35.75"h] w24h24 + Product Details Size –

+ Product Details Size – 24" x 28" or 28" x 24" is the size for the duct opening measurement only

Actual Filter Size – 19 3/4"w x 21 3/4" x 1"

+ Product Details Size - 10"w X 8"h X 2"d (for duct opening measurement only)

+ Product Details Size – 22" x 26" or 26" x 22" is the size for the duct opening measurement only

Actual Filter Size – 9 3/4"w x 9 3/4" x 1"

20"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 35.75"h] w24h24 + Product Details Size –+ Product Details Size 20"w X 34"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 21. 75" Width X 35. 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