I'm having a heck of a time with my Adobe huffing and puffing. It does it most every fill with wood especially if the boiler is still hot and has some coals left. I put in a barometric damper last year and I have a draft inducer. It puffs out the damper and fills my boiler room with smoke. Sure am glad the room is outside, I'd be dead meat if it was in the house. It eventually stops. The sides of the boiler start moving like bellows. Do you think putting stiffeners on them would help. We sure got the shaft from Adobe. Just hope I can get a couple more years out of that piece of junk.