I don't know why I haven't asked this before now. When I bought my first stove, an Englander, I used 3" DuraVent pipe. When I bought my Harman, the pipe didn't mate to the stove properly. With the stove adapter from the Englander on the pipe, the pipe and exhaust port on the Harman were the same diameter. Without the adapter, the pipe would fit inside the exhaust port, which is how I have it connected. Obviously if I left it like that, a lot of smoke would come into the house. Upon the advice of my dealer, I sealed it with aluminum tape. My problem is I still get a strong smoke smell upon startup and shutdown, especially early in the year. Several times I've laid by the pipe with a mag light trying to see if it smokes on startup, but nothing is visible. Is there an adapter available that will mate 3" DuraVent pipe to a Harman correctly?