ISO 15957:2026

Overview

ISO 15957:2026 – Test dusts for evaluating air cleaning equipment specifies the properties of load test dusts used for laboratory evaluation of heating, ventilation, air conditioning (HVAC) air filters, as well as other air cleaning equipment. The standard is designed to ensure consistency when simulating dust loading in laboratory environments, rather than providing criteria for evaluating filtration efficiency. It covers the physical and chemical characteristics, particle size distribution, and procedures for the handling and dispersal of test dusts, supporting realistic filter performance assessments under controlled conditions.

Key Topics

• Scope and Purpose

  • Focuses on test dusts specifically intended for loading HVAC air filters and laboratory air cleaning devices.
  • Does not address test dusts used to evaluate filtration efficiency.

• Test Dust Categories

  • L1: A standard mixture used for primary filter (pre-filter) testing, simulating urban aerosol size distributions.
  • L2: Arizona desert sand-based dust for simulating PM10 distributions.
  • L3: Sintered KANTO loam for simulating PM2.5, suitable for secondary filters.
  • L4: A mixture relevant for residential areas, based on fine test dust with milled cotton linters.
  • L5: Titanium dioxide, used primarily as a white pigment, representing residential aerosol distributions.

• Properties and Requirements

  • Defines median particle diameter, density, and chemical composition for each test dust.
  • Specifies analysis procedures for particle size distribution.

• Handling and Distribution

  • Requirements for dust feeder equipment to ensure constant, uniform particle supply.
  • Guidelines for pre-conditioning the dust (drying and using dry air for dispersion).
  • Duct design considerations to maintain consistent dust concentrations.

Applications

ISO 15957:2026 is applied in laboratories and certification facilities focused on:

• Performance Testing of HVAC Air Filters

  • Replicates dust loading scenarios representative of real-world urban and residential environments.
  • Supports classification of air filters, estimation of energy consumption, and life cycle cost analysis.

• Validation of Air Cleaning Equipment

  • Assures that devices intended for building ventilation systems are tested using standardized dust properties.
  • Provides repeatable procedures for inter-laboratory comparison and regulatory compliance.

• Support for Product Development

  • Enables filter manufacturers to benchmark new filter media or air cleaning solutions under controlled and repeatable load conditions.

• Quality Control and Certification

  • Ensures reliability in filter performance data used for technical documentation, tendering, and regulatory submissions.

Related Standards

Testing and classification of HVAC filters and air cleaning equipment frequently reference the following standards in conjunction with ISO 15957:2026:

• ANSI/ASHRAE 52.2: Method of testing general ventilation air-cleaning devices for removal efficiency by particle size (related to L1 test dust).
• ISO 12103-1: Test contaminants for filter evaluation, specifically Arizona test dust (relevant to L2, L4).
• ISO 16890-3: Determination of the gravimetric efficiency and air flow resistance versus the mass of test dust captured.
• SAP 14-12: Standard of Association of Powder Process Industry and Engineering (for L3 test dust).
• ANSI/AHRI 680 (I-P): Performance rating of residential air filter equipment (for L4).
• JIS Z 8901 and JIS B 9908: Japanese standards for test powders and air filter units.

Practical Value

Adherence to ISO 15957:2026 establishes a common reference for test dusts used in air filter laboratory evaluation, promoting uniformity, reproducibility, and comparability of results across national and international laboratories. This benefits filter manufacturers, test laboratories, specifiers, and regulatory authorities by enabling reliable life cycle assessments and product qualifications in HVAC and air cleaning applications.