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.
Watchya got in that poodle gun? Anything for me? Or this tiny ad?
Homesteading and Permaculture Bundle - More than 35 Things
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