
Particle Size | Examples | Filter Class | Typical Applications |
---|---|---|---|
Coarse dust, particle size > 10 µm |
|
G 1 G 2 |
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G 3 G 4 |
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Fine dust, particle size 1 - 10 µm |
|
M 5 |
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M 5 M 6 F 7 |
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F 7 F 8 F 9 |
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Suspended particulates, particle size < 1 µm |
|
E 10 E 11 E 12 |
|
E 11 |
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E 12 H 13 |
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H 14 U 15 U 16 |
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Filter Class | Final Test Pressure Drop | Average Arrestance(Am) of ASHRAE test dust | Average Efficiency(Em) of 0.4 µm particles |
---|---|---|---|
Pa | |||
G1 | 250 | 50% ≤ Am < 65% | - |
G2 | 250 | 65% ≤ Am < 80% | - |
G3 | 250 | 80% ≤ Am < 90% | - |
G4 | 250 | 90% ≤ Am | - |
F5 | 450 | - | 40% ≤ Em < 60% |
F6 | 450 | - | 60% ≤ Em < 80% |
F7 | 450 | - | 80% ≤ Em < 90% |
F8 | 450 | - | 90% ≤ Em < 95% |
F9 | 450 | - | 95% ≤ Em |
Filter Class | Final Test Pressure Drop | Average Arrestance (Am) of ASHRAE test dust | Average Efficiency (Em) of 0.4 µm particles | Minimum Efficiency* of 0.4 µm particles |
---|---|---|---|---|
Pa | ||||
G1 | 250 | 50% ≤ Am < 65% | - | - |
G2 | 250 | 65% ≤ Am < 80% | - | - |
G3 | 250 | 80% ≤ Am < 90% | - | - |
G4 | 250 | 90% ≤ Am | - | - |
M5 | 450 | - | 40% ≤ Em < 60% | - |
M6 | 450 | - | 60% ≤ Em < 80% | - |
F7 | 450 | - | 80% ≤ Em < 90% | 35% |
F8 | 450 | - | 90% ≤ Em < 95% | 55% |
F9 | 450 | - | 95% ≤ Em | 70% |
*Minimum efficiency is the lowest efficiency among the initial efficiency, discharged efficiency and the lowest efficiency throughout the loading procedure of the test.
The characteristics of atmospheric dust vary widely in comparison with those of the synthetic loading dust used in the tests. Because of this the test results according EN 779 do not provide a basis for predicting either operational performance or life. Depending on their design, filters can be operated under actual site conditions to higher final pressure drops than those given here.
Filter Class | Overall Value | Local Value | ||
---|---|---|---|---|
Efficiency | Penetration | Efficiency | Penetration | |
E 10 | ≥85% | ≤15% | - | - |
E 11 | ≥95% | ≤5% | - | - |
E 12 | ≥99.5% | ≤0.5% | - | - |
H 13 | ≥99.95% | ≤0.05% | ≥99.75% | ≤0.25% |
H 14 | ≥99.995% | ≤0.005% | ≥99.975% | ≤0.025% |
U 15 | ≥99.999 5% | ≤0.000 5% | ≥99.997 5% | ≤0.002 5% |
U 16 | ≥99.999 95% | ≤0.000 05% | ≥99.999 75% | ≤0.000 25% |
U 17 | ≥99.999 995% | ≤0.000 005% | ≥99.999 9% | ≤0.000 1% |
Filter Class | Overall Value | Local Value | ||
---|---|---|---|---|
Efficiency | Penetration | Efficiency | Penetration | |
ISO 15 E | ≥95% | ≤5% | - | - |
ISO 20 E | ≥99% | ≤1% | - | - |
ISO 25 E | ≥99.5% | ≤0.5% | - | - |
ISO 30 E | ≥99.90% | ≤0.1% | - | - |
ISO 35 H | ≥99.95% | ≤0.05% | ≥99.75% | ≤0.25% |
ISO 40 Hd | ≥99.99% | ≤0.01% | ≥99.95% | ≤0.05% |
ISO 45 Hd | ≥99.995% | ≤0.005% | ≥99.975% | ≤0.025% |
ISO 50 U | ≥99.999% | ≤0.001% | ≥99.995% | ≤0.005% |
ISO 55 U | ≥99.999 5% | ≤0.000 5% | ≥99.997 5% | ≤0.002 5% |
ISO 60 U | ≥99.999 9% | ≤0.000 1% | ≥99.999 5% | ≤0.000 5% |
ISO 65 U | ≥99.999 95% | ≤0.000 05% | ≥99.999 75% | ≤0.000 25% |
ISO 70 U | ≥99.999 99% | ≤0.000 01% | ≥99.999 9% | ≤0.000 1% |
ISO 75 U | ≥99.999 995% | ≤0.000 005% | ≥99.999 9% | ≤0.000 1% |
Please note: