HEPA filter pressure drop

The pressure-drop for HEPA filtration is dependent on the types and amounts of media used in the filter, per unit area of the filter face. Pressure drops can be as low as 0.1 inches w.g. (24.9 Pa) and as high as 1.0 inches w.g. (249 Pa), with significant energy use impacts resulting from the nonlinear power use requirements of higher pressure drop filters. Lower pressure drop filters usually have higher first cost but offer the benefit of lower operating cost, in part because of their higher dust-holding capacity. [Naughton, "HVAC Systems... Part 1," 1990; Micro-Electronics Facility Efficiency Workshop, 1995]

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