MissMac
Minister of Fire
I have a stove collar adapter which connects my telescoping double wall pipe to the collar on the stove. Smoke puffed out of where the telescoping pipe rests in the stove top adapter. So the inner layer is crimped, and sits like a V down in the adapter piece. I would say it is likely not super air tight no. It's a connection. Chimney sweeps retract that piece of pipe up to vacuum out the top chamber after a sweep. I can't imagine I'd be the only one with this type of set up? I think it was just a really freaky gust of wind that rushed down the chimney. It was howling when i lit the fire. In response to your suggestion though Highbeam, I don't really know how I could make that connection any less leaky? It is kind of inherently designed to be moved around (i.e. retract).Is your pipe to stove connection not pretty dang air tight? I could see smoke rolling out of the open door during a reversal but to have smoke visibly pouring out of a joint in the flue system would have me looking at the integrity of that joint. You don't want leaks in the flue. Those will spoil your draft and introduce cold air.