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

Filter type	Face velocity m s“1	Pressure Drop Pa	Arrestance %	Atmospheric dust spot efficiency %
Automatic Viscous	1.87-2.50	100	80
Dry	2.54-3.58	125	70-80	—
Panel Cleanable, viscous	1.9-2.7	80	65-80
Cleanable, dry	1.72	95	70-76	—
Disposable	1.8-3.78	135	70-89	—
Bag Low-efficiency	3.78	220		30-50
Medium-efficiency	3.78	220	—	55-90
High-efficiency	2.54	220	—	90-97
Absolute Low-efficiency	1.40	110, 750		95
Medium-efficiency	1.26	250, 750	—	99.7
High-efficiency	1.26	250, 875	—	99.997
Electrostatic Agglomerator with storage section	2.54	100		90

Notes

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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