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Pressure Drop over a Rectangular Opening

thread403-500201

Pressure Drop over a Rectangular Opening

Pressure Drop over a Rectangular Opening

(OP)
Can anyone point me to something that explains how to find the pressure drop of a rectangular opening in a wall for a certain CFM?
Thank you.
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RE: Pressure Drop over a Rectangular Opening

SMACNA and ASHRAE show the C-values. They differ for air entering, or exiting.

Also some here

RE: Pressure Drop over a Rectangular Opening

(OP)
Thanks, couldn't find much in ASHRAE but SMACNA had a lot of C-values. Nothing for a wall openings but I chose the closest I could get from their duct coefficients.

RE: Pressure Drop over a Rectangular Opening

In most cases it flows from a duct to a room. but it also makes a difference if the duct discharge is in the same plane with the wall, or if the duct sticks out.
If you find multiple values, use the most conservative value.

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