It sounds like you have more than enough to go ahead and screw it to the flue collar. Drill pilot holes for the screws first.
If there is a large gap between the flue collar and the adapter you can use flat or rope stove gasket to fill the gap. No need to insulate that last little bit.
If there is a large gap between the flue collar and the adapter you can use flat or rope stove gasket to fill the gap. No need to insulate that last little bit.
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