Close all vents in basement
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.
When you set up your flair system, you enter in the total number of vents, and the total number of flair vents connected to that furnace.
Flair simply divides this out, and only allows 1/3 of the vents to be closed to prevent over-pressurization of the system. Keep in mind that if you manually partially/close vents, you should also make sure of the same.
My understanding is that in the app, each furnace is supposed to be set up as a separate "home".
Each thermostat gets its own "zone" in flair ( in your case e.g. [2 zones for home1] and [1 zone for home2] )
Each "room" is controlled by one puck and any number of vents (i.e. my entire basement is one "room" with 3 vents).
If you would like to override the 1/3 rule, you can set the total number of vents to whatever you like. Just be mindful of the reason for the rule.
I see, thanks for clarifying. This thread reply by Flair Support states that each furnace should have its own "home" set up inside the app IF you want independent control of the systems.
Sal - generally we recommend a single home for most users. The rare exception is cases where within a home you want to run a zone in heat and another in cool simultanously. You might even be able to do that in auto with a single home in the event that the flair mode is set to auto although I honestly can't quite remember. Generally its quite unusual but not unheard of to need to run heat in some places and cool in another. The most common scenario we see is AirBnBs, hotels, etc. Great suggestion above on the total number of vents - the 1/3 rule assumes everything was sized conventionally but if a contractor or homeowner added more supply registers then you can definitely adjust that slider to meet your needs while still keeping some back pressure protection in place.
I don't have a % off hand but if I had to wager a guess it would be something like 99.5%. There are very slight ~.5mm tolerances around where the louvres meet the frame to allow them to close without running into tolerance issues at manufacturing. I'm guessing its a tighter than the keen vents but I haven't really looked at those closely.
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