BS EN 1020:2009 借助风扇传输燃气和/或燃烧产物的空间加热净加热输入功率不超过300 kW的非家用燃气强制对流空气加热器
Non-domestic forced convection gas-fired air heaters for space heating not exceeding a net heat input of 300 kW incorporating a fan to assist transportation of combustion air or combustion products