10"w X 10"h Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 11.5" Width X 11.5" Height - SEE BELOW IN DESCRIPTION HOW TO MEASURE A GRILLE Weather Proof & Pest Proof - Louver Are Designed To Block Any Rain From Getting Inside - Back Mesh Net Protects Against Pests Never Rust - High Quality Rigid Aluminum Rigid Built For External Use – 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. Anodised Finish - Smooth & Beautiful
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