I'm just wondering why the installer went from what appears to be six to eight at the elbow, and then ran such a long horizontal relative to the vertical?
Couldn't find the appropriate 6-8 increaser?
I would expect to see that at the wall, then the 6 elbow, and then the short vertical connection to the stove collar.
Actual smoke in the house, rather than residual should set of the smoke detectors.
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