尽管这种结合自身可能是一个好的实践，但火炉烟囱却不是。

Although the alignment itself may be a good practice, stovepiping is not.

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从2004年开始，北京已取缔了94000个煤火炉。高热效的电热供暖器，使得以前每年因燃烧约100,000吨的煤而产生的煤烟，在北京胡同的烟囱里消失。

Since 2004, Beijing has replaced 94, 000 pot-bellied coal stoves with efficient electric heaters, eliminating the filth that came from chimneys burning roughly 100, 000 tons of coal a year.

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火炉的烟囱冒出黑烟。

The stove chimney discharged dark smoke.

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