ANSI/ASHRAE 62.2-2025

Ventilation and Acceptable Indoor Air Quality in Residential Buildings

Defines the roles and minimum requirements for mechanical ventilation and natural ventilation systems and other measures intended to provide acceptable indoor air quality (IAQ) in individual dwelling units. Applies to dwelling units in residential occupancies in which the occupants are nontransient. Considers chemical, physical, and biological contaminants that can affect air quality. Thermal comfort requirements are not included in this standard. Informative Note: See ANSI/ASHRAE Standard 55, Thermal Environmental Conditions for Human Occupancy, for thermal comfort requirements. While acceptable indoor air quality (IAQ) is the goal of this standard, it will not necessarily be achieved, even if all requirements are met a) because of the diversity of sources and contaminants in indoor air and the range of susceptibility in the population; b) because of the many other factors that may affect occupant perception and acceptance of IAQ, such as thermal environment, acoustical environment, visual environment, and psychological factors; c) if the ventilation air is unacceptable and this air is brought into the dwelling unit without first being cleaned; d) because of contaminant transport from adjacent spaces; e) if the system or systems are not operated and maintained as designed; or f) when high-polluting events occur. This standard does not claim to achieve acceptable IAQ in buildings in which smoking is permitted. Informative Note: See the ASHRAE Position Document on Environmental Tobacco Smoke (ETS) for more information on ETS in buildings. Dual units of measurement.