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Tjernlund V2D Model UnderAire Crawl Space Fan Ventilator, Deluxe 2 Fan, 220 CFM and 950-8304 Underaire Steel Crawl Space Vent, Steel Diamond Pattern, 18" x 10" Screen bundle: Amazon.com: Industrial & Scientific
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Simple Deluxe 16 Inch Mount Fan Attic Gable Ventilator with Adjustable Temperature Thermostat, 2065 CFM, Black
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