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Old 10-10-2019, 09:16 AM   #2
DQDick
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Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
As far as I know, there is no simple way to block one AC from using the entire duct system. You can buy replacement supply vents that close, but then you have to get up there and open them before the other AC comes on or you'll probably freeze one or both of the units up.
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