Classification according to efficiency
The filters in common use have typical efficiencies and arrestances as listed in Table 17.1, according to Eurovent standards.
Table 17.1 Typical classification of arrestance and efficiency
1. The figures are based on averages of manufacturers’ data.
2. Where two pressure drops are given they are for the clean filter and the dirty filter.
3. A single pressure drop represents an average figure.
4. Absolute (ULPA) filters with efficiencies as high as 99.999995% are also possible.
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