Suncourt Radon Fan Mitigation Kit, Centrax Inline Centrifugal Fan with 4 inch to 3 inch Rubber Couplers, Indoor and Outdoor Installation QUIET OPERATION - The impeller is properly balanced and paired with the motor making this a powerful, yet near silent when used with the anti-vibration PVC couplers. AIR PRESSURE INDICATOR - This kit comes with one air pressure indicator which enables you to monitor pressure in the line. WATERTIGHT AND UV RESISTANT - The thermal plastic resin housing won't yellow and is epoxy sealed for performance and durability. This makes it good for continuous indoor or outdoor use. RADON REMOVAL - This system works by changing air pressure beneath your home and then the specially designed radon fan draws out the radon gas and safely vents it above your roofline. MOUNTING TOOLS INCLUDED - Everything you might need to mount this radon kit is included; self tapping screws, hex nuts, lock washers, mounting brackets, and more.