HVAC Premium 18"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 19.75"h] Material_Steel Design – Fixed Hinged for

Design – Fixed Hinged for easy filter change & cleaning - uses a 1" thick filter

Upgrade your air distribution strategy today – invest in the efficiency and convenience of the 8" Radial Damper

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The 1/2" black insulation

Commercial Grade Aluminum - Will Never Rust - Designed for Warehouses

HVAC Premium 18"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 19.75"h] Material_Steel Design – Fixed Hinged for+ Product Details Size 18"w X 18"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 19. 75" Width X 19. 75" Height Weather and Pest Proof These louvers are especially designed to prevent water from entering your home, and with a built in back 1 2" mesh they also protect you from annoying rodents like mice, rats, birds, and squirrels High Quality Aluminum The premium durable aluminum will never rust and it will never