6"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 21.75"h] with filter + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 16"w X 24"h is the size for the duct opening measurement only

+ Product Details Size – 14"w X 24"h is the size for the duct opening measurement only

preventing tampering and maintaining consistent temperature settings

at predicted low air motion 35 fpm in the zone of occupancy

baffles and plaster frames available

6"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 7.75"w x 21.75"h] with filter + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 16"w X 24"h is the size for the duct opening measurement only + Product Details Size – 14"w X 24"h is the size for the duct opening measurement only