The right side of my chamber is leaning inward towards the flame. Quite often, as you will see, the flame "licks" this sidewall. Chamber is almost 5 years old. The reason why I ask is that per another thread last month, I had my heat exchanger get plugged up with soot causing exhaust to fill back into the house. The tech cleaned the heat exchanger and leaned the mixture out a little, but I never got a definitive answer why it happened in the first place. Burner is serviced yearly. I have read that the chamber impinging on the flame can cause sooting.
So I have attached a video (don't worry sound is muted!) which shows the right side where it is now. The viewing port is above and to the right of the gun, so it is a good viewing angle for the top of the sidewall in question. You can't see from the angle but the wall sticks out like that almost all the way to the bottom of the chamber.
Click on the image to view it. What do you guys think?