I saw a few posts relevant to the 7100 on the forum, so I decided to ask the experts and other users here. I have a newly installed Quadra-Fire 7100. Only had a few fire in it so far. However, there is cold air leaking out the front by the ACC lever when there is no fire, also there is a slight woodsmoke smell in the house without a fire in the FP. I read one way to check if the outside combustion air shutoff is working is to start a fire with newspapers, then shut the outside air damper (clockwise on the knob) and the fire should go out, then rotate counter clockwise and it should start back up. It made no difference. After the fire died, and over two minutes after the OAK shutoff was closed, there was still a good draft present within the fireplace (I could see embers and the burned paper moving around).
My dealer said that he checked with Quadra-Fire and they said that when you shut off the outside air, the damper opens to inside air and the fire drafts that way.
I understood that the knob and shutoff were installed in the newer 7100s to prevent cool air drafts into the house from the unit when no fire was present, but if it just rotates to inside air, why would this help?
Thanks for your help on this!