18"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 19.75"w x 25.75"h] 10" Round Duct Pipe The first number in a Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

The first number in a grille size

+ Product Details Perfect Fit & Easy Sizing - Designed for a 34" x 8" Or 8" x 34" duct opening (measured at the opening)

Multi-shutter damper with handle operator to adjust air flow

Airflow – Easy unrestricted airflow for your HVAC system

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18"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh White [Outer Dimensions 19.75"w x 25.75"h] 10" Round Duct Pipe The first number in a Compatible With Duct 7in Applications This sheet metal DDAG A 1212 The first number in a grille size + Product Details Perfect Fit & Easy Sizing Designed for a 34" x 8" Or 8" x 34" duct opening (measured at the opening)