DIN 30697-3
DIN 30697-3 Portable fan-assisted air heaters; LPG-fired air heaters with heat-exchanger; safety requirements, testing marking
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 12/01/1990
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 12/01/1990