Application for air heater type 841: E.g. punctiform heating of working places, thermal shielding at doors, heating of building containers, and dressing rooms. Consisting of a sheet steel housing, built-in high-capacity heating elements, not brought to red heat an axial-flow fan. Features: Including indicating lamp and robust rotary switch. Position 0 = off Position 1 = 1/3 power Position 2 = 2/3 power Position 3 = 3/3 power