[青儿]

最近开暖气，发现有异味从暖气口出来。后来发现地下室也有这种异味气体。好担心。

特请教这会是什么气体，从什么地方出来，

有没有危害，该如何去除？

若是找专业人士检查，该打什么电话？

谢谢。

[DayInDayOUt]

1. Water the drain(s) once a week so the "U" pipe can block the gas from main drain.
2. Check your vent fan and its pipe for unexpected guest in your bathroom if you have one.