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the opposite side is flat for easier mounting
57 Blade Diameter (in
A: Accessories such as end caps
PEX-A Flexibility: Bends easily to reduce fittings and leak points in runs
18 in. x 9 in. Silver Galvanized Steel Crawl Space Fan Vent Formica FX Radiance the opposite side is flatThe Tjernlund UnderAire Series V2D Crawl Space Ventilator fan is designed to circulate fresh outdoor air underneath homesand porches. Excessive humidity levels in Crawl Spaces is the leading cause of premature rotting of support columns,joists, floors and beam supports. Humidity can promote fungus growth and increased termite activity. Humidity may alsocause plumbing failures due to rust and corrosion. Constant operation helps vent radon gases,
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