The Delta breezradiance RAD80LED combines a quiet bath Fan, LED light and heater all in one with built-in thermostat and brushless dc motor for superior reliability and efficiency. Airflow rating of 80 cfm (±10%) and 1.5 sones at 0.1 static pressure. Power consumption approximately 10.5 watts with an efficiency rating approximately 7.6 cfm/watt. Duct diameter no less than 4” built-in thermostat to regulate temperature. Features a 1300 watt heating element with built-in thermostat for consistent temperature and conforms to cul safety standards. Metal guard to help prevent user contact with heating wire. Heater element with 1300W heater module equipped with thermal cutoff fuse and thermostat.