Pressure balance at duct junctions
Pressure balance at duct junctions
(OP)
Is pressure balance at duct work junction required only for equal friction method? I used equal velocity method to size my duct, do I need to balance pressure at junctions?





RE: Pressure balance at duct junctions
RE: Pressure balance at duct junctions
RE: Pressure balance at duct junctions
RE: Pressure balance at duct junctions
you can make calculations manually using ashrae handbook, but there are precise while cheap software packages like DuctNet.
RE: Pressure balance at duct junctions
RE: Pressure balance at duct junctions
RE: Pressure balance at duct junctions
Trying to "balance" a system in the design phase with duct sizing is not economical. It will take a lot of time and effort on your part, the ductwork will NOT be installed EXACTLY as you designed, require lots of custom duct sizes and lots of custom fittings and transitions.
You are better off sizing your duct work (mains and branches) to maintain approximately 0.08-0.1" wg / 100 feet using "off-the-shelf" duct sizes and your ductulator. So a balancing agent can 'balance' the system in the field, specify manual balancing dampers at branches and take-offs. Then do a minimum number of pressure drop calculations to find the most remote diffuser and size your fan to provide sufficient pressure at that point. Everything upstream of that will then work itself out.