HEPA Single Fiber Filter MPPS Calculator
Cleanroom air filtration physics: Compute single-fiber capture efficiencies for Brownian diffusion ($\eta_D$), direct interception ($\eta_R$), and inertial impaction ($\eta_I$) to locate the Most Penetrating Particle Size (MPPS).
Filter Media Physical Characteristics
Microglass: 0.5–3 μm
Fraction of solid fibers (5–12%)
Pleated face speed: 2–10 cm/s
Test Particle Evaluation Size
Standard test challenge particle size
Filter Media Filtration Efficiency
Filter Media Efficiency E:
--
% at selected d_p
Estimated MPPS:
--
μm (Minimum Efficiency)
Penetration P:
--
100% - E
Single Fiber η_Σ:
--
combined capture
Pressure Drop ΔP:
--
Pascals (Pa)
Mechanism Breakdown (Single Fiber)
| Capture Mechanism | Single Fiber η | Dominant Particle Range |
|---|---|---|
| Brownian Diffusion (η_D) | -- | < 0.1 μm (Nanoparticles) |
| Direct Interception (η_R) | -- | > 0.3 μm (Physical size) |
| Inertial Impaction (η_I) | -- | > 1.0 μm (High inertia) |
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