Insulation is not necessarily a great idea.
It's not code, but if you have vented with standard double wall gas vent, it will probably be fine. I'd probably risk it IF the wood fence isn't near anything else combustible. If it is, you probably need to go with code clearance gaps. Your heater manual probably has those dimensions. You might have to get a piece of galvanized sheet metal, with an appropriately sized hole, to fill the gap in the fence.
If you want to be super safe, splice in a section of stainless triple wall wood stove vent.
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