Foghorn Sound

[Rolf1]

Brand new beautiful insert pellet stove and I noticed that when the heat really gets cranking that sometimes I'll hear this really deep horn type sound. Like a tuba or foghorn. Could this be the exhaust air passing through and up the exhaust pipe?
It's not loud but...odd I guess.

Thanks

 

[fbelec]

we had this noise a few years back when we were installing munchkin boilers and it was all in the fuel to air mixture. not sure if this is the reason but if it is, it's a place to start

 

[Rolf1]

we had this noise a few years back when we were installing munchkin boilers and it was all in the fuel to air mixture. not sure if this is the reason but if it is, it's a place to start

Interesting.
I have a Quadrafire Trekker and there is a "Trim" adjustment which regulates the fuel/air mixture.

Thanks for the suggestion.