20"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 37.75"h] w14h14 + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 24"w X 12"h is the size for the duct opening measurement only

Actual Filter Size – 27 3/4"w x 25 3/4" x 1"

actual front end outer dimensions are approximately 26 5/8" width X 30 5/8" height

+ Product Details Size - 14"w X 12"h is the size for the duct opening measurement only

+ Product Details Durable Construction - Made with clear

20"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 21.75"w x 37.75"h] w14h14 + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 24"w X 12"h is the size for the duct opening measurement only Actual Filter Size – 27 3 4"w x 25 3 4" x 1"