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Type firstDescription
22"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 23.75"w x 21.75"h] w12h12 actual front end outer dimensions actual front end outer dimensions are approximately 30 5 8" width X 28 5 8" height ISO Supply Diffusers perform efficiently with air loadings of 6 to 30 air changes per hour (based on 10 ft
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