32"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 33.75"w x 29.75"h] 10" Diameter Design – Unrestricted airflow for 7" Round Duct Pipe CRG828 Product Details Size 14

Design – Unrestricted airflow for your HVAC system - adjustable one-way louver with full horizontal airflow directional control - single deflection supply grill with 96% airflow - noise free components - no vibrating louvers etc

+ Product Details Size - 10"w X 4"h is the size for the duct opening measurement only

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+ Product Details Size – 32"w X 26"h is the size for the duct opening measurement only

75"H – fits a 18" X 4" duct opening

32"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 33.75"w x 29.75"h] 10" Diameter Design – Unrestricted airflow for 7" Round Duct Pipe CRG828 Product Details Size 14 Design – Unrestricted airflow for your HVAC system adjustable one way louver with full horizontal airflow directional control single deflection supply grill with 96% airflow noise free components no vibrating louvers etc + Product Details Size 10"w X 4"h is the size for the duct opening measurement only