F7–F9 EN 779
Replaced by ISO 16890, but still commonly used in the industry
Typical Efficiency
F7: 80–90% | F8: 90–95% | F9: ≥95%
Reference Particle Size
≈0.4 μm
Commonly used in HVAC secondary/final filtration, commercial buildings, and medical HVAC upgrades.
E10–E12 EN 1822 (EPA)
Overall Efficiency
E10: ≥85% | E11: ≥95% | E12: ≥99.5%
Reference Particle Size
≥0.5 μm (method-dependent)
Typically used as high-efficiency sections or pre-HEPA filters; depending on design, can approach HEPA-level performance.
H13–H14 EN 1822 (HEPA)
Overall Efficiency
H13: ≥99.95% | H14: ≥99.995%
Reference Particle Size
≥0.3 μm (H13 local ≥99.75%)
Used in cleanrooms, critical medical zones, and ultra-high cleanliness environments.