Constantly, with just a little wind, my chimney makes burping sounds. Maybe for ten seconds. It has the little spin thingey on top. It's just for the fireplace (which I never use) so it's not a big deal. But I don't know WHAT is making the machine-gun sound.
I know I should snap a video of it but it's intermittent. I will try to video it but it's also short (ten seconds, at most) each time. There's a little wind, and it just happened, but it's not happening now.
Anyway, I realize I'm not giving you much to go on ... but just in case the sound is symptomatic of something (that should be) obvious ... may I ask:
What would make a chimney burp like a machine gun relatively loudly (at about the noise level of a calm conversation) for a couple of seconds at a time in no wind and low wind?