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Loss Coefficient For Duct Not Equal

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baltt
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Loss Coefficient For Duct Not Equal

Hello

 

I'm trying to match the Loss Coefficient for 100ft of 24in duct at 3600 cfm. My Calculations say .016323 base on the Altshul-Tsal friction factor. 

 

Revit gives me a value of .821083

 

I'm trying to find the pressure Loss for this section of duct but I need this information to be right.

Can anyone verify this calculation

 

Thanks  

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