I think it's a tricky line between helping to keep room air from escaping, and hindering exhaust flow at startup and possibly running. The prevention of downdraft is obviously a good thing no matter what.
In any event, I wouldn't use one that had plastic involved, but stick to all metal, just in case.
What is that? Is that a mongol horde? Can we fend them off with this tiny ad?
Heat your home with the twigs that naturally fall of the trees in your yard
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