Duct Pressure Classification?
Duct Pressure Classification?
(OP)
Can anyone tell me where I would find the definition of "medium pressure" ducting? I've looked in my SMACNA manuals and can't find it. Is this, perhaps, an outdated definition. Everyone uses the term, but I can't find a definition written down anywhere.





RE: Duct Pressure Classification?
Low Pressure 0 to 2 inch wg
Med Pressure 2 to 6 inch wg
High Pressure 6 to 10 inch wg
Hope this will help. It came from a design manual I put together a long time ago. I don't know the reference. It is most likly ASHRAE.
RE: Duct Pressure Classification?
RE: Duct Pressure Classification?
I think that some of the common philosophy is that the vertical risers and mains are high, the ducts leading to terminal boxes are medium, and the duct work downstream of terminal boxes are low...
This all depends on the sheet metal gauge and how the ducts are put together, and the sealant used. I'm not the authority on this, but have had some experience...