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ASHRAE Duct Fitting Database

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Ralph MV

Ralph MV

Mechanical
Jan 31, 2024
1
US
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

duct_forum_rgebyn.png
 
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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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