ASHRAE Duct Fitting Database

Ralph MV · Jan 31, 2024

I am working on duct pressure calcs and I am running into a scenario where I am stumped on selecting the proper fitting from the Duct fitting database. I am not sure if anyone else is using it on this forum but if so, any help is appreciated. This is what I am working with

HVAC-Novice · Jan 31, 2024

I recommend using the SMACNA fittings. If you have multiple similar fittings, I use the most conservative value. Note that some values also depend on direction of flow (I use the more conservatives). I have that all implemented in Revit.

Revit by default uses ASHRAE fittings and i found those to be very lacking and often not actually existing in real World.

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ASHRAE Duct Fitting Database

Ralph MV

Mechanical

HVAC-Novice

Mechanical

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