30"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 15.75"h] Powder Coated This versatile guard features air LO246 Product Details Size 32 Compatible with Duct 4"

This versatile guard features air circulating ports on all four sides to allow proper airflow

+ Product Details Size - 20"w X 16"h is the size for the duct opening measurement only

providing maximum flexibility

+ Product Details Size – 4"h X 12"h is the size for the duct opening measurement only

30"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 31.75"w x 15.75"h] Powder Coated This versatile guard features air LO246 Product Details Size 32 Compatible with Duct 4" This versatile guard features air circulating ports on all four sides to allow proper airflow + Product Details Size 20"w X 16"h is the size for the duct opening measurement only