vertical heating flue

例句：

1. 1. The vertical heating flue is an important part of the furnace's design.
   垂直加热烟道是炉子设计中的一个重要部分。
2. 2. The vertical heating flue helps to distribute heat evenly throughout the building.
   垂直加热烟道有助于均匀地将热量分布在建筑物内。
3. 3. The vertical heating flue was installed to improve the efficiency of the heating system.
   垂直加热烟道的安装是为了提高供暖系统的效率。