Advantage: Versatility: vent fan can be installed anywhere such as: Greenhouse, Attics, Bathrooms,smoking room, ect Motor Type: external rotol motor with the automatic reset thermal overload protector and copper wire to provide superior motor cooling and durability.Inline fan's bearing use permanently lubricated dual ball bearing to perform maintenance free operation Radon fan's casing material : thick plastic for waterproof IP67, blower for exaust and intake can be installed in outdoor and indoor Insulation Standard: Class F insulation Speed controllable: you need to connect power cord with a control speed range switch to reach high to low speed Accessories: Pre-wired 4-feet power cord US 110/120V standard household plug
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