Lifecycle Testing Results of Dimple Pleat Radial Flow HEPA Filters Under Ambient and Elevated Conditions

Figures & data

Table 1 TABLE 1 Filter pack design parameters for the safe change and remote change filter types

Filter type	Safe change	Remote change
Number of pleats	345	330
Media (m^2)	29.73	29.17
Interior diameter (cm)	33.02	27.94

FIG. 1 Challenge aerosol particle size distribution.

Figure 2 FIG. 2 Mass loading versus differential pressure curves for all filters tested under ambient conditions until rupture.

Figure 3 FIG. 3 Filtering efficiency and differential pressure versus time.

Figure 4 FIG. 4 Filtering efficiency versus particle diameter, or penetration curve, for a remote change radial flow HEPA filter challenged with Carbon black under ambient conditions. (Color figure available online.)

Figure 5 FIG. 5 Differential pressure, humidity, and temperature versus time for the first remote change filter challenged at elevated levels of temperature and RH. (Color figure available online.)

Figure 6 FIG. 6 Effect of increased volumetric flow rate on filter differential pressure.

Figure 7 FIG. 7 Filter evaluated at actual flow with elevated temperature followed by elevated RH. (Color figure available online.)