... ,PTC heater ,industrial fan heater ,fan heater , industrial Heater ,heater ,PTC heater ,industrial fan heater ,fan heater These heaters are used in enclosures ... position vertical airflow (air outlet up, connection on bottom)Operating/Storage temperature -45 to +70 °C (-49 to +158 ... °F)Operating / Storage humidity max. 90 % RH (non-condensing)Protection type/Protection class ...