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
非家用强制对流燃气空气加热器 用于空间供暖 净热输入不超过300 kW 包括一个风扇 用于辅助燃烧空气或燃烧产物的运输