VEVOR 4 to 4.5 inch Radon Fan Installation Kit, Quiet 260CFM Radon Mitigation Fan System Kit with 2 Couplers, Pressure Indicator, Waterproof Inline Duct Fan Exhaust Fan for Indoor Outdoor VentilationQuiet OperationHigh Airflow ExhaustQuality AssuranceEasy InstallationVersatile ApplicationPlug-and-Play ConvenienceMaximum Speed: 2700 RPM,Item Model Number: HEE-100P,Airflow per Speed Setting: 260 CFM,Rated Power: 75 W (US) / 51 W (EU),Maximum Airflow: 260 CFM,Product Dimensions: 12 x 12.6 x 9.25 inches / 305 x 320 x 235 mm,External Diameter of Inlet and Outlet: 4-4.5 inches / 98-114 mm,Net Weight: 7.9 lbs / 3.6 kg (US), 9.26 lbs / 4.2 kg (EU)