This HP Series Inline Radon Fan from Fantech features a high-efficiency EBM motorized impeller with 157 to 344 CFM that is designed for radon mitigation. Sealed housings and wiring boxes prevent radon leakage and water penetration. The inline radon fan is approved for mounting in wet locations, including outdoors, and has an average life expectancy of 7-10 years under continuous use situations. The fan also includes automatic reset thermal overload protection and carries a five-year factory warranty. The fans are available for a 4" or 5" duct or for a 6" duct. Ships via UPS/FedEx Ground.