How to tie in fireplace heat duct?

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New Member
Oct 2, 2021
Snohomish USA
New old house, basement fireplace has a fan forced to duct, tie to cold air return or make a ceiling vent near cold air return?
So the fan is mounted on the outside of the house pulls fresh air around heater box and sends to a 8" duct. How should I finish this off? Drywall starts in 2 weeks and need to finish this off. Really pumps out the heat!

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