ISO 5011:2025

Overview

ISO 5011:2025 - Inlet air cleaning equipment for internal combustion engines and compressors - Performance testing defines a uniform laboratory test code for comparing air cleaners. The standard specifies test procedures, conditions, required equipment and a standardized performance report to measure the principal performance attributes of inlet air cleaning equipment used in automotive and industrial internal combustion engines and compressors.

Key topics and technical requirements

• Scope and purpose: Enables direct laboratory performance comparison of air cleaners (dry-type, multistage, oil bath) used on engines and compressors.
• Primary performance parameters: airflow restriction / differential pressure, dust collection efficiency, dust capacity, and oil carry-over (for oil bath air cleaners).
• Test materials and conditions: Defines test dust, test oil, absolute filter media validation, temperature and humidity control, and measurement accuracy/precision.
• Test procedures by type:
  • Dry-type single-stage: restriction tests, efficiency tests (absolute filter method and direct weighing method), capacity, pressure-collapse and variable airflow tests.
  • Dry-type multistage: initial and full-life efficiency, capacity, scavenged airflow variations, precleaner and secondary element testing.
  • Oil bath: restriction, oil carry-over, full-life efficiency/capacity and recovery tests.
• Measurement corrections and sensitivity: Includes airflow/resistance corrections to standard conditions and penetration sensitivity assessments.
• Reporting and annexes: Informative report sheets, data presentation formats (restriction vs flow, capacity), and normative annexes detailing equipment and test explanations.

Practical applications

• Product development and R&D: Compare filter media and air cleaner designs under controlled laboratory conditions.
• Quality control and production testing: Verify that manufacturing output meets performance expectations for restriction, efficiency and capacity.
• Supplier evaluation and procurement: Objectively compare candidate air cleaners for engines and compressors.
• Certification and regulatory support: Provide standardized test evidence for compliance and performance claims.
• Troubleshooting and field-lab correlation: Reproduce and analyze suspected performance issues under controlled conditions.

Who should use ISO 5011:2025

• Air cleaner and filter manufacturers
• Automotive and industrial OEM engineers and specifiers
• Independent testing laboratories and certification bodies
• Purchasing and quality assurance teams
• Research organizations studying particulate filtration for engines/compressors

Related notes

• This fifth edition replaces ISO 5011:2020 with technical revisions (e.g., capacity no longer depends on scavenge flow rate).
• Annexes provide templates and detailed equipment descriptions to support consistent, SEO-relevant searches for “ISO 5011:2025 test procedures,” “air cleaner efficiency testing,” and “inlet air cleaning equipment standards.”