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Absolutely, We need to know the cfms of unit (Can be verified by model number) and the size of the existing ducts to properly size any new ducts though.Foe example a 12 " duct will carry approx. 800 cfms so we could run 4 seven inch ducts off of it without losing velocity.
Inside of duct.
As long as the air can circulate back that is normal. If doors do not have a gap underneath, you want to consider trimming bottom of doors or adding grilles so air can circulate when doors are closed.