chimney vibration

After I fire up my Vigas 40, while flue temp is increasing between 220- 270 degrees (approximately). I get a deep humming sound. I installed a barometric damper because I though this would help but it continues to do it. Wasn't sure if this was normal if it is something I should be concerned with.....

Humming?

Or rumbling?

Gassification produces a rumble - I kind of like it.

(That's the way it is here - so I hope it's normal...)

I've gotten a similar sound. I always thought it was right around when gasification starts. BUT... in my case I thought it was from the cardboard I'm using (wife's business generates a ton) was really roaring.

don't know

JP

I've had what I think you're describing. Happens on startup when there's a vigorous fire in the upper chamber and you switch to downdraft operation. I *think* what's happening is the flame front is switching from above the nozzle to below the nozzle, back and forth. This gets the air column in the chimney vibrating like a giant pipe organ. Not a gasification rumble - more like the helicopter of doom hovering over your chimney.

Increasing fan speed and/or primary air seems to solve it in my case.

I liked the Helo of doom thing.............. LOL great explination!

TS