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SIZE ?C 36w X 36h Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 37.75" Width X 37.75 Height - SEE BELOW IN DESCRIPTION HOW TO MEASURE A GRILLE. Weather and Pest Proof ?C These Louvers are especially designed to allow passage of air into your home while preventing water from entering, and with a built-in back 3/16?? mesh they also protect you from annoying rodents like mice, rats, birds, and squirrels. High Quality Aluminum ?C The premium durable Aluminum will Never Rust and it will never wear through leaving the material with an elegant, beautiful, and smooth surface, adds a luxurious touch to any home. Louvers are built to withstand hurricanes, tornados and tropical storm conditions. Rigid Built For External Use ?C The sturdy and rigid design features noise free components that eliminates vibration and excess noise to the Louvers. These are built Heavy Duty for installation into brick and cement walls. Can be used to ventilate the crawlspace to protect your home from foundational water leak damage and moisture. HVAC Premium has been providing superior in quality service for many many years. /b br br 36"w X 36"h Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 37.75" Width X 37.75" Height - SEE BELOW IN DESCRIPTION HOW TO MEASURE A GRILLE /b br br br Never Rust /b - Our high quality rigid aluminum is the longest lasting grille on the market. It will never rust and can be easily cleaned. Click Add to Cart Now!