Enhance your indoor air quality with the VEVOR Radon Fan Installation Kit. Designed for 4 to 4.5-inch ducts, this quiet fan operates at an impressive 190 CFM, ensuring efficient radon mitigation. The kit includes two couplers for easy installation, a pressure indicator for monitoring performance, and a waterproof inline duct fan for reliable operation in any environment. Whether for indoor or outdoor use, this fan system is perfect for maintaining a healthy living space. Say goodbye to radon worries and enjoy peace of mind with this comprehensive ventilation solution!