4" to 4.5" Radon Mitigation Fan System Quiet 380 CFM Inline Duct Fan Waterproof Quiet Operation High Airflow Exhaust Quality Assurance Easy Installation Versatile Application Plug-and-Play Convenience Maximum Speed: 2600 RPM,Item Model Number: HEE-150P,Airflow per Speed Setting: 380 CFM,Rated Power: 140 W (US) / 61 W (EU),Maximum Airflow: 380 CFM,Product Dimensions: 14 x 13.19 x 9.25 inches / 355 x 335 x 235 mm,External Diameter of Inlet and Outlet: 4-4.5 inches / 98-114 mm,Net Weight: 7.5 lbs / 3.4 kg (US), 8.6 lbs / 3.9 kg (EU)