DIN EN 621:2002
无风扇输送助燃气体和/或燃烧物质、净热输入功率不超过300kW的空间加热用非家用燃气式强制对流空气加热器
Non-domestic gas-fired forced convection air heaters for space heating not exceeding a net heat input of 300 kW, without a fan to assist transportation of combustion air and/or combustion products