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  1. Kapp

    What is the difference between ASHRAE fitting SR4-2 and ER4-2?

    Both look identical to me, but the pressure loss coefficients are different. I'm trying to understand why the pressure drop would be different if the air flow was going to a fan or coming from a fan. It's not a converging/diverging difference, because that is accounted for in the A0/A1 value...

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