Occasional Loud Bang from somewhere

Does it sound like it’s the ductwork? I’ve heard the aluminum ductwork “bang” upon sudden changes in temperature.

daveinbedstuy

in Heating 11 years and 10 months ago

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dasensation | 11 years and 10 months ago

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Hello. I have a combo air conditioner and heating in one system. It is a very narrow and tall furnace if it matters. Long time ago, there was a loud bang once and I had a tech come out and repair it. Well he found 3 leaks and he took care of that. But the loud bang would still come up afterwards again on occasion. I asked him about that and he didn’t know what to tell me, so I just thought it is the way it operates. Basically, pilot comes on, I hear the other burners light up and after about 10 seconds the loud bang may happen. It only happens on occasion, very seldom. Now I haven’t been at my place for a while, due to some circumstances I moved in to my parents place, but I was wondering is this something that sounds dangerous?

dasensation | 11 years and 10 months ago

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Also because it is a building I could have sworn that I heard that lound bang come from other apartments too. Thanks.