It is the combustion air. Pull back the insulation and duct tape any holes and then reapply the insulation. IF it is totaly wasted try getting a short piece of the 5" insulated flex and splice it together using duct tape. If you really want to do a good job, use a piece of 5" pipe (around 6") and put the flex on each side and tape.
The can should be about a foot off the ground.
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