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Thank you once again You have been very helpful. Yes that is what I was trying for is more air flow. It seems ok downstairs but upstairs is not much air coming from the registers. I guess the furnace was underated for the size of the house. I even tried replacing some of the ductwork from 9" to...

What kind of problems would you think it would create?

Thank you. I appreciate your input

I have a Trane XE90 Gas furnace. How do I increase the blower motor speed?