BS EN 778:2009
不用风扇辅助传输燃气和/或燃烧产物的空间净加热输入功率不超过70kW的家用燃气强制对流空气加热器
Domestic gas-fired forced convection air heaters for space heating not exceeding a net heat input of 70 kW, without a fan to assist transportation of combustion air and/or combustion products