Overview
EN ISO 29463-5:2022 - "High-efficiency filters and filter media for removing particles in air - Part 5: Test method for filter elements" - specifies standardized test methods to determine filter efficiency at the most penetrating particle size (MPPS). It is part of the ISO 29463 series for HEPA/ULPA filter classification and is intended for use together with ISO 29463‑1, ‑2, ‑3 and ‑4. The document replaces the 2018 edition and includes updated normative references and a revised Annex C for filters using charged media.
Key topics and technical requirements
- MPPS-based efficiency testing: Defines procedures to measure local and overall filter efficiency at the MPPS using particle counting techniques (liquid or solid aerosols). For micro‑glass media MPPS is typically around 0.12–0.25 μm.
- Test methods: Describes a reference efficiency test, an alternate efficiency method (including scan testing - Annex A), and a statistical method for lower‑efficiency (Group E) filters.
- Aerosols and instrumentation: Covers mono‑disperse and poly‑disperse aerosol generation, sampling locations, particle counters and sizing instruments, and calibration/conditioning of test air.
- Test rig and conditions: Specifies requirements for the test duct, airflow adjustment and measurement, aerosol mixing section, filter mounting, pressure‑drop measurement points, and environmental/test air conditions.
- Special media rules: Annex B provides guidance for filters with MPPS ≤ 0.1 µm (e.g., membrane filters); Annex C (normative) covers testing/classification methods for filters using (charged) synthetic fibres.
- Evaluation and reporting: Prescribes evaluation procedures, pass/fail criteria, required test report data, and maintenance/inspection of test apparatus.
- Scope of efficiencies: The ISO 29463 series addresses filter efficiencies from ~95% up to 99.999995% for HEPA/ULPA classification.
Applications and users
EN ISO 29463-5:2022 is used by:
- Filter manufacturers for product development, type testing and certification of HEPA/ULPA filter elements.
- Independent test laboratories to perform standardized efficiency testing and to generate compliant test reports.
- Cleanroom engineers, HVAC designers and facility managers who specify filters for pharmaceutical, semiconductor, healthcare, laboratory and critical‑clean environments.
- Procurement and quality assurance teams requiring standardized acceptance testing and traceable filter performance data.
- Regulators and accreditation bodies that reference harmonized test methods for air filtration performance.
Keywords: EN ISO 29463-5:2022, high-efficiency filters, MPPS test method, HEPA, ULPA, filter elements, filter media testing, particle counting, aerosol generation.
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