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10"w X 10"h Aluminum Exterior Vent for Walls & Crawlspace - Rain & Waterproof Air Vent with Screen Mesh - HVAC Grille - White [Outer Dimensions 11.5”w x 11.5”h] - - Amazon.com
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18" w X 18" h Anodized Aluminum Exterior Vent for Walls & Crawlspace - Rain & Waterproof Air Vent with Screen Mesh - HVAC Grille [Outer Dimensions 19.5”w x 19.5”h] - - Amazon.com
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