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Thanks for the info. The new furnace will be installed in 2 weeks so I will continue with my ductwork and then ask the installer to make some recommendations.

Thanks for the info. We just moved into a house that was built in 1869 and I'm trying determine if the duct work is correct. There is no duct work to the 2nd floor which I'm in the process of adding. I have limited space on the 2nd floor so I have added a 6" duct to the master bedroom, 5" to...

Is there a rule of thumb or formula to determine the amount of cold air returns required and where they should be placed?