[EN 14511-1:2022, 3.30]:negative pressure difference measured between the air (or water) outlet section and the air (or water) inlet section of the unit, which corresponds to the total pressure drop of all components on the air (or water) side of … Continue reading →

(See surface pressure distribution)

[EN 12792:2003, 297]:difference in total pressure between two points in an installation usually caused by frictional resistance to flow in a duct or component.