ISO 16814:2008

Overview

ISO 16814:2008 - Building environment design - Indoor air quality (IAQ) - Methods of expressing the quality of indoor air for human occupancy - provides a framework for expressing and specifying acceptable indoor air quality in commercial and institutional buildings. It supports design of new buildings and retrofit projects, covering spaces with mechanical, natural or mixed ventilation. The standard does not apply to typical residential, industrial buildings and hospitals (except parts similar to commercial buildings). ISO 16814:2008 enables designers to set IAQ target levels that reflect local requirements, constraints and occupant expectations.

Key topics

• Methods of expressing IAQ - three principal approaches are covered:
  • Health-based methods (tied to guideline values and contaminant concentrations),
  • Perceived air quality (PAQ) and sensory acceptance (odour and irritation),
  • Ventilation-rate based methods (airflow, air change rate and carbon dioxide as an indicator).
• Design process and conformance - integrating IAQ objectives into design briefs, documenting assumptions, and demonstrating compliance with selected IAQ targets.
• Terminology and metrics - definitions such as dilution index, air change effectiveness, emission rate, occupancy density and acceptable IAQ.
• Source control and mitigation - considerations for contaminant sources, emission factors, local exhaust, air cleaning and HVAC-related emissions.
• Limitations and uncertainties - acknowledging that acceptable IAQ cannot be guaranteed for every individual due to outdoor air quality, diverse indoor sources, thermal and sensory factors, and population variability.
• Informative annexes - practical guidance on pollutant sources and control, HVAC emissions, air cleaning devices, ventilation effectiveness and examples of WHO guideline values.

Applications and who uses it

ISO 16814:2008 is used by:

• Building designers and architects integrating IAQ targets into the design brief.
• HVAC engineers selecting ventilation rates, filtration and air-cleaning strategies.
• Facility managers and consultants when specifying retrofit measures or evaluating building performance.
• Regulatory bodies and project owners seeking a documented, consistent approach to indoor air quality in commercial and institutional projects.

Practical uses:

• Defining IAQ target levels for offices, schools, retail and institutional spaces.
• Choosing between health-based, perceived-quality or ventilation-rate strategies.
• Informing decisions on source control, local exhaust, and HVAC filtration/air cleaning.

Related standards

• ISO 16813 (Building environment design - Indoor environment - General principles) is normative for context and alignment with broader indoor environment design guidance.

Keywords: ISO 16814:2008, indoor air quality, IAQ, ventilation rate, HVAC, building design, perceived air quality, health-based IAQ, commercial buildings.