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Thanks for your help offrapel and vogad.
I want to increase relative humidity of the house in wintertime. The heat is gas furnace that heats air and forces it throughout the house. The heating people can install those moisture injector to the duct.
About the level of air exchange, middle 1/3 of the house is open between the first and second level, but the air ducts are not connected between floors. I don't know what kind of air exchange occur there. There is no active exchange but there is a large connected area.
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