ASHRAE+62.1-2022+(1) - Page 008
Extracted Content
occupant sensor: a device such as a motion detector or a captive key system that detects the presence of one or more persons within a space.
occupiable space: an enclosed space intended for human activities excluding spaces that are intended to be occupied occasionally and for short periods of time, such as storage rooms, equipment rooms, and emergency exitways.
occupied mode: when a zone is scheduled to be occupied.
occupied standby mode: when a zone is scheduled to be occupied and an occupant sensor indicates zero population within the zone.
odor: a quality of gases, liquids, or particles that stimulates the olfactory organ.
openable area: net free area of an opening.
patient care area: an area used primarily for the provision of clinical care to patients. Such care includes monitoring, evaluation, and treatment services.
particulate matter 2.5 (PM2.5): aerosol particles with an aerodynamic diameter less than or equal to a nominal 2.5 µm.
readily accessible: capable of being reached quickly for operation without requiring personnel to climb over or remove obstacles or to resort to the use of unsafe climbing aids such as tables or chairs.
residential occupancies: occupancies that are not classified as institutional by the authority having jurisdiction (AHJ) and that contain permanent provisions for sleeping.
sleeping unit: a room or space in which people sleep that includes permanent provisions for living, eating, and either sanitation or kitchen facilities but not both. Such rooms and spaces that are also part of a dwelling unit are not sleeping units.
stratified air distribution system: a device or combination of devices applied to provide a stratified thermal and pollutant distribution within a zone.
unoccupied mode: when a zone is not scheduled to be occupied.
unusual source: an item or activity not usually expected within an occupancy category and that has the potential to create contaminants. ( Informative Note: Informative Appendix J contains information on sources and contaminants expected in certain occupancy categories.)
ventilation: process of supplying air to or removing air from a space for the purpose of controlling air contaminant levels, humidity, or temperature within the space.
ventilation zone: any indoor area that requires ventilation and comprises one or more spaces with the same occupancy category (see Table 6-2 ), occupant density, zone air distribution effectiveness (see Section 6.2.1.2), and design zone primary airflow (see Section 6.2.4.3.2 and Normative Appendix A) per unit area. ( Informative Note: A ventilation zone is not necessarily an independent thermal control zone; however, spaces that can be combined for load calculation purposes can often be combined into a single zone for ventilation calculations purposes.)
volume, space: total volume of an occupiable space enclosed by the building envelope, plus that of any spaces permanently open to the occupiable space, such as a ceiling attic used as a ceiling return plenum.
zone air distribution effectiveness: ratio of the change of contaminant concentration between the air supply and air exhaust to the change of contaminant concentration between the air supply and the breathing zone.
3.2 Initialisms, Abbreviations, and Acronyms
AHJ authority having jurisdiction ACGIH American Conference of Governmental Industrial Hygienists AgBB Committee for Health Related Evaluation of Building Products (German) AHRI Air Conditioning, Heating, and Refrigeration Institute AIHA American Industrial Hygiene Association AMCA Air Movement and Control Association ANSI American National Standards Institute ASHE American Society for Health Care Engineering BSL biological safety level Cal California
6 ANSI/ASHRAE Standard 62.1-2022