It may have been because the DVD burner was blocking the air vent.
它可能是因为DVD刻录机挡住了气孔。
Mechanical structure parts, vent-pipe of engine, combustion engine of boiler, burner.
机械构造用件，发动机排气管，锅炉燃烧室，燃烧器。
Before feeding water, air vent valves, pressure gauge valve, water level gauge, burner supply valve and steam supply valve should be opened fully. Other valves and checking manhole close.
上水时，空气阀、压力表阀及水位计通汽通水阀开足，其他阀门和检查门无孔门应一律关闭。
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