Duct work pressure is combination of static and velocity pressure.
Velocity pressure Pv is produced by speed of air movement
Static pressure s.w.g which maintains flow against restistance.
Total pressure is the sum of the veloicty pressure and the static pressure.
Did You Know?
If for a given duct size the if air flow is reduced then velocity pressure will also fall as the air speed will decrease, assuming that all other factors/ parameters don't change.
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