20"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 25.75"h] Color_Black + Product Details Size –

+ Product Details Size – 32" x 36" or 36" x 32" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 24 5/8" width X 30 5/8" height

5" - SEE BELOW IN DESCRIPTION How To Measure A Grille

Actual Filter Size – 24 3/4"w x 21 3/4" x 1"

+ Product Details Size - 20"w X 28"h is the size for the duct opening measurement only

20"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 25.75"h] Color_Black + Product Details Size –+ Product Details Size 20"w X 24"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 21. 75" Width X 25. 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