ISO 5011-2025 PDF

Full title and description

St ISO 5011-2025 — Inlet air cleaning equipment for internal combustion engines and compressors — Performance testing. This International Standard defines laboratory test procedures, test conditions, required equipment and a standardized performance report to enable direct comparison of the performance of air cleaners (air filters and complete air-cleaning assemblies) used on engines and compressors in automotive and industrial applications.

Abstract

ISO 5011-2025 specifies uniform methods for measuring the principal performance characteristics of inlet air cleaning equipment: airflow restriction (pressure drop), dust collection efficiency, dust-holding capacity and, where applicable, oil carry‑over for oil-bath or oil-wetted cleaners. The standard defines test dust, test rig arrangements, conditioning and reporting requirements so laboratories and manufacturers can produce comparable, repeatable performance data for selection, design validation and quality control.

General information

• Status: Published (International Standard, current edition)
• Publication date: September 2025 (Edition 5)
• Publisher: ISO — International Organization for Standardization
• ICS / categories: 43.060.20 (Air intake systems and related components)
• Edition / version: Edition 5 (2025)
• Number of pages: 50

Scope

This standard applies to inlet air cleaning equipment used on internal combustion engines and compressors and covers the laboratory performance testing needed to compare different air cleaners. It addresses the measurement of differential pressure (flow restriction), particle collection efficiency across a defined particle-size range, dust capacity under prescribed dust-loading conditions, and oil carry‑over where oil-bath or oil-wetted cleaners are used. The standard defines test dust, flow conditions, environmental conditioning, instrumentation and the structure of the performance report. It is intended for use in automotive, off‑highway and general industrial applications; it does not define engine acceptance criteria or installation-specific requirements beyond the test conditions used to generate comparative performance data.

Key topics and requirements

• Standardized test rig arrangements and instrumentation for measuring airflow and pressure drop.
• Definition and preparation of test dusts and dust‑loading procedures to measure dust-holding capacity and efficiency.
• Methods to determine instantaneous and cumulative particle collection efficiency over specified size ranges.
• Procedures to report differential pressure (initial and loaded), dust capacity and efficiency curves.
• Specific test sequences and conditioning for oil-bath/oil-wetted cleaners, including oil carry‑over measurement.
• Requirements for calibration, uncertainty reporting and test repeatability to ensure laboratory comparability.
• Mandatory content and format for the performance report to support direct comparison between products and test laboratories.

Typical use and users

ISO 5011-2025 is used by air cleaner and filter manufacturers, engine and compressor OEMs, independent test laboratories, certification and regulatory bodies, R&D and product development teams, and aftermarket filter suppliers. Typical uses include product development and validation, comparative performance testing, quality control, procurement specification verification, and supporting claims about filter efficiency, dust capacity and operating restriction.

Related standards

Related documents and predecessors include earlier editions of ISO 5011 (for example 2020 and 2014 editions) and other sector test codes for air-cleaner performance (notably the SAE J726 family of air cleaner test codes). The standard is produced under the work of ISO/TC 22/SC 34 (air intake systems). Stakeholders should also consider national/adopted versions where applicable and complementary filtration standards that address other environments or filter classes.

Keywords

air cleaner, air filter, inlet air cleaning equipment, performance testing, differential pressure, pressure drop, dust collection efficiency, dust capacity, oil carry‑over, internal combustion engine, compressor, test methods, ISO 5011

FAQ

Q: What is this standard?

A: ISO 5011-2025 is the International Standard that defines laboratory test procedures and reporting requirements to measure and compare the performance of inlet air cleaning equipment for internal combustion engines and compressors.

Q: What does it cover?

A: It covers test methods for measuring airflow restriction (pressure drop), particle collection efficiency, dust‑holding capacity and oil carry‑over (for oil-based cleaners), plus requirements for test dusts, instrumentation, test conditioning and the structure of the performance report.

Q: Who typically uses it?

A: Manufacturers of air cleaners and filters, engine and compressor OEMs, independent test laboratories, product developers, certification bodies and procurement/specification engineers use this standard to generate comparable performance data.

Q: Is it current or superseded?

A: ISO 5011-2025 is the current (published) edition, replacing the previous edition (ISO 5011:2020). The earlier editions (2014, 2000, etc.) have been superseded by the 2025 edition.

Q: Is it part of a series?

A: Yes—ISO 5011 has a history of earlier editions (the ISO 5011 series) addressing the same subject; the standard is maintained under ISO technical committee work for vehicle/engine intake systems (ISO/TC 22/SC 34). It is complementary to other filtration and air-quality standards used in different sectors.

Q: What are the key keywords?

A: Air cleaner, air filter, inlet air cleaning equipment, performance testing, pressure drop, dust capacity, collection efficiency, oil carry-over, internal combustion engine, compressor.