OK so I ran calculations for heat dividing the three areas of the master suite into bed, bath and sitting room. The results were:
Bed
Bthu 3775
2 - 6" runs
59 sq in
189 cfm
Bath
Bthu 6463
4 - 6" runs
100 sq in
323 cfm
Sitting
Bthu 6208
3 - 6" runs
76 sq in
310 cfm
The rooms are all connected but have no doors separating the areas.
The existing ducts are:
Bed
2 - 6" runs feeding 2 4x10 floor supply registers
2 - 6" runs connect to 2 6x10 wall mounted returns
Bath
3 - 6" runs feeding 3 4x10 floor supply registers
1 - 6" run serving a 4x10 wall mounted supply 1' above floor (this is a wall register on both sides of a shared wall between bath and sitting area
There are no returns in the bath
Sitting
3 - 6" runs serving 3 4x10 floor supply resisters
plus the other half of the wall mounted register I mentioned for the bath.
There is one return 6x10 wall mounted with a 6" line connected through 30' of 6" round to the return plenum in the basement.
I didn't mention before but the house has two HVAC systems one for basement/main floor and the other for the second floor. We are talking about the second floor system.
So I conclude I am pretty close on the supply side of the equation. You could maybe argue for an additional supply register in the bath area but it looks OK. The question is the lack of return grills. Is this resulting in pressurization of these areas and consequently causing underperformance of the supply side. (ie the room pressurizes but without the retrun the duct performance is lowered and the cfms aren't accomplished)
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