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hlpflwthat · M
Something is not right if animals can get in there. Not sure if you have any choice in using your furnace right now or not, but a restricted chimney/vent can cause carbon monoxide to back up into the home. It is supposed to be varmint-proof for yours and the animals' sake. I'd get someone on it ASAP. The fix is cheap - a few bucks of 1/2" mesh.
ProdigalSummer · F
@hlpflwthat it's just for a gas fireplace that we never really use. I know it needs a screen but I'm not going up there to put it on