Review Article
Technology Review of Modern Gas Turbine Inlet Filtration Systems
Table 1
Summary of filter classification for ASHRAE 52.2:2007 [
10], EN 779:2002 [
11], and EN 1822:2009 [
12–
16].
| | ASHRAE 52.2:2007 [10] | | EN 779:2002 [11] | EN 1822:2009 [12–16] | ASHRAE filter class |
Average particles size efficiencies in micron (%) | EN filter class | | | | | E1 | E2 | E3 | Average separation efficiency (Am) | Average separation efficiency (Em) | Total filtration separation efficiency (%) | Local filtration separation efficiency (%) | MERV | 0.3–1.0 | 1.0–3.0 | 3.0–10.0 | | | | | |
| 1 | | | <20 | G1 | 50 ≤ Am < 65 | | | | 2 | | | <20 | | | | | | 3 | | | <20 | G2 | 65 ≤ Am < 80 | | | | 4 | | | <20 | | | | | | 5 | | | 20–35 |
G3 |
80 ≤ Am < 90 | | | | 6 | | | 35–50 | | | | 7 | | | 50–70 |
G4 |
90 ≤ Am | | | | 8 | | | >70 | | | | 9 | | <50 | >85 |
F5 | |
40 ≤ Em < 60 | | | 10 | | 50–65 | >85 | | | 11 | | 65–80 | >85 |
F6 | |
60 ≤ Em < 80 | | | 12 | | >80 | >90 | | | 13 | <75 | >90 | >90 | F7 | | 80 ≤ Em < 90 | | | 14 | 75–85 | >90 | >90 | F8 | | 90 ≤ Em < 95 | | | 15 | 85–95 | >90 | >90 | F9 | | 95 ≤ Em | | | | | | | E10 | | | 85 | | 16 | >95 | >95 | >95 | E11 | | | 95 | | | | | | E12 | | | 99.5 | | 17 | | | |
H13 | | |
99.95 |
99.75 | 18 | | | | | | 19 | | | |
H14 | | |
99.995 |
99.975 | 20 | | | | | | | | | | U15 | | | 99.9995 | 99.9975 | | | | | U16 | | | 99.99995 | 99.99975 | | | | | U17 | | | 99.999995 | 99.9999 |
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Note: Correlations between ASHRAE and EN standard are approximate.
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