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I will be replacing a fire place the new one has 2 8 inch heat duct I would like to duct it into the force air system
If you run it to the cold air return you can use the furnace blower to distribute the heat.
I would caution you to care for the chimney and those vents very carefully. The house across the street burned down because of a failure in the joints around the same kind of set up. The owner cleaned the chimney but he didn't get those vents.