TERMS USED FOR CLASSIFICATION OF FILTERS
EN 779 |
European standard for prefilters and gross and fine filters of class G1 - F9 |
EN 1822 |
European standard for fine filtration in HEPA and ULPA filters of class H10 - U17 |
W x H x D (mm) |
Outer dimension of filters |
v (m³/hod) |
Nominal volume flow rate of air |
Δ p-init. (Pa) |
Filter initial pressure drop (clean filter) |
Δ p-fin. (Pa) |
Filter final pressure drop (recommended replacement) |
v (m/s) |
Nominal frontal velocity of air |
Am (%) |
Mean value of separation of gross filters of class G1 - G4 |
Em (%) |
Mean value of efficiency of fine filters of class F5 - F9 |
Ε (%) |
Mean value of efficiency of HEPA and ULPA filters |
t (°C) |
Filter thermal resistance |
MPPS |
Most Penetrating Particle Size |
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