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Advantage: Versatility: Radon fan can be installed anywhere such as: Greenhouse, Attics, Bathrooms,smoking room, ect 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 There is 1pcs soundproof sponge and 1pcs soundproof net in our every duct fan to reduce noise. Speed controllable: you need to connect power cord with speed controller to reach high to low speed Packing include: 1. 1pcs 4 inch inline duct fan. 2. 1pcs Pre-wired 4-feet power cord with US 100/125V standard household plug 3. 1 pcs mounting bracket 4. 4 pcs clamps for pvc joint 5. 2 pcs Variable Diameter Connector PVC Joint, Pipe Increasers 100/110 mm Radon Mitigation Basics For most homes, the mitigator will follow three steps to reduce airborne radon: diagnostic evaluation, sealing and installation of the airborne radon reduction system. The most commonly installed type of system uses active soil depressurization (ASD), formerly called sub-slab depressurization (SSD). Another method involves the installation of a heat recovery ventilator. The radon mitigator will design the right system for your home, depending on its design, the underlying soil, and other factors. The airborne radon system works by changing air pressure beneath your home and then, through the use of a specially designed radon fan, drawing out the radon gas and safely venting it, through one or more pipes, above the roofline. Usually, an airborne radon system will be routed in the interior of the home, through the garage, or to the exterior.