26"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 9.75"h] w24h24 actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in

actual front end outer dimensions are approximately 26

+ Product Details Size - 20"w X 2"h is the size for the duct opening measurement only

controlled by a switch

actual front end outer dimensions are approximately 24 5/8" width X 16 5/8" height

+ Product Details Size - 4"w X 34"h is the size for the duct opening measurement only

26"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 27.75"w x 9.75"h] w24h24 actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in actual front end outer dimensions are approximately 26 + Product Details Size 20"w X 2"h is the size for the duct opening measurement only