We have 2 furnaces - 1 with a single zone for the 2nd floor and one with 2 zones for the main floor. When the basement was finished 4 vents were added to the existing duct work going to one of the zones on the main floor. As a result it is very hard to control the temperature in the basement and the one zone on the main floor. When the basement is not in use we cover the 4 vents with magnetic covers and when it is in use, it take some adjusting. My thinking for an initial setup would be to replace the 4 basement vents with flair, but I want to make sure I can keep the all 4 closed and then only have them adjusting when the basement is in use. I seem to have read that Flair will only allow 1/3 of the vents to be closed? that makes no sense in my use case as the 4 vents didnt exist in the original design.
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