一般是针对固态燃料的燃烧，通过减小进风的手段，以减慢燃烧速率，但是不灭火。封的要义在于（大部而非全部）封闭进风。
上床睡觉之前，别忘了封火。
防火罩由封火保温装置和过滤排烟装置两部分组合成。
The fireproof cover is formed by combining a fire sealing and heat insulating device and a filter fume extractor.
转炉氧枪口采用蒸汽封火，既节约有油氮气，又利用回收蒸汽。
It can economize oil nitrogen gas as well as make full use of recovery steam to use steam to bake the fire in the converter cover opening.
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