After having observed my flair system in operation for several months now, I am convinced there is a serious flaw in how the backpressure protection feature interacts with vent prioritization.
I have 9 total vents in my home, meaning that flair will only allow 3 of them (1/3) at most to be closed at any given time. This much is clear, and understandable. I believe others on this forum have raised the issue of whether there should be some override for this ratio, but that is not my concern here. What I am concerned about is how the system decides which vents should be allowed to be closed, and which it will keep open for backpressure protection.
Very often we have seen that an "Active" room will be kept open while "Away" rooms are allowed to close. It seems that this is the goal of the current algorithm: to prioritize airflow to active rooms over away rooms. I have to say I think this is wrong. This results in active rooms being over-cooled (or over-heated when heating).
See the example from the screenshot I have attached. Our master bedroom (where our infant son sleeps) is at 67 degrees for a target temperature of 74 (a 7 degree deviation) and yet the vent is kept open for backpressure protection, allowing cold air to pour in and cool the room even further! This is despite the fact that there are other rooms with closed vents that could profit from some extra cooling. The only reason I can think that they were not targeted is because they were marked as away.
I would much prefer that air flow to an "away" room that could use extra cooling than for an active room to be over-cooled this much. The goal of the system should be to make the active rooms as pleasant as possible (as close to their target temperatures as possible), shouldn't it?
Since there is a limited number of vents that can be closed at any point, these should be seen as a scarce resource, and so should be allocated efficiently to achieve optimal temperature for active rooms. An active room that is well past its set-point should have priority to be allocated one of these scarce vent-closures. Away rooms should have lower priority for these closures, and only be allocated when it's clear that all active rooms have an appropriate setting (open or closed).
I understand that it can sometimes make sense to close vents in away rooms to help divert air towards active ones, but this should take lower precedence than active rooms that are over-cooled (or over heated when heating).
I look forward to some fix for this issue in a future update.
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