Overview
ISO 29463-1:2024 - "High efficiency filters and filter media for removing particles in air - Part 1: Classification, performance, testing and marking" defines how high-efficiency air filters (including EPA/HEPA/ULPA classes) are classified, tested, assessed and marked. Part 1 sets out the classification framework and general requirements and is intended to be used together with ISO 29463-2, -3, -4 and -5. The standard is derived from EN 1822 and uses a particle-counting approach at the most penetrating particle size (MPPS) to determine both local and overall filter efficiency (ranging from Group H/E efficiencies through ultra-low penetration grades).
Key technical topics and requirements
- Filter classification: Filters and filter elements are grouped and classed according to efficiency/penetration at the MPPS. New E classes were added in this edition.
- Performance metrics: Integral (overall) and local removal efficiency, penetration, pressure drop (Δp), nominal air volume flow rate and medium velocity are specified as assessment parameters.
- Test methods overview: General test rig and test condition requirements, aerosol generation and measurement principles are described. The series uses particle-counting instruments and aerosols (references include CPC, OPC, DMA/DMPS and test aerosols such as PAO/DEHS/PSL as applicable).
- Leakage and efficiency tests: Includes scan (leakage) methods and procedures for determining filter element efficiency and air flow distribution (Annex C provides an air velocity uniformity test on autoscan systems).
- Documentation and marking: Requirements for test reports, marking conventions, and documentation that accompany certified filters are specified.
- Informative annexes: Guidance on nanoparticle filtration considerations (Annex A) and a summary of classification and test methods (Annex B).
Practical applications and users
ISO 29463-1:2024 is essential for:
- Filter manufacturers validating product performance for EPA/HEPA/ULPA markets
- Independent test laboratories performing efficiency and leakage testing
- HVAC and cleanroom designers specifying filtration for healthcare, pharmaceutical, semiconductor, laboratory and critical manufacturing environments
- Procurement, facility managers and regulators verifying filter marking, documentation and conformity
The standard supports reliable selection of high efficiency filters, consistent test reporting, and traceable marking for critical air-cleaning applications.
Related standards
- ISO 29463-2: Aerosol production, measuring equipment and particle-counting statistics
- ISO 29463-3: Testing flat sheet filter media
- ISO 29463-4: Scan method for determining leakage of filter elements
- ISO 29463-5: Test method for filter elements
Keywords: ISO 29463-1:2024, high efficiency filters, HEPA, EPA, filter classification, MPPS, particle counting, filter testing, leakage scan, filter marking, filter media, filtration performance.
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