ASHRAE+62.1-2022+(1) - Page 007

Extracted Content

dwelling unit: a single unit providing complete, independent living facilities for one or more persons, including permanent provisions for living, sleeping, eating, cooking, and sanitation.

energy recovery device: a device or combination of devices or system to transfer heat and/or water vapor between separate outdoor and exhaust airstreams.

environmental tobacco smoke (ETS): “aged” and diluted combination of both side-stream smoke (smoke from the lit end of a cigarette or other tobacco product) and exhaled mainstream smoke (smoke that is exhaled by a smoker). ETS is commonly referred to as secondhand smoke . This definition includes smoke produced from the combustion of cannabis and controlled substances and the emissions produced by electronic smoking devices.

equipment well: an area (typically on the roof) enclosed on three or four sides by walls that are less than 75% free area, and the lesser of the length and width of the enclosure is less than three times the average height of the walls. The free area of the wall is the ratio of area of the openings through the wall, such as openings between louver blades and undercuts, divided by the gross area (length times height) of the wall.

ETS area: spaces where smoking is permitted, as well as those spaces not separated from spaces where smoking is permitted in accordance with the requirements of Section 5 in this standard.

ETS-free area: an area where no smoking occurs and that is separated from ETS areas according to the requirements of this standard. ( Informative Note: A no-smoking area is not necessarily an ETS-free area.)

evaporative heat rejection equipment: heat rejection devices, including open-circuit cooling towers, closedcircuit cooling towers, and evaporative condensers, with an open water circuit that reject heat through the evaporation of water.

exfiltration: uncontrolled outward air leakage from conditioned spaces through unintentional openings in ceilings, floors, and walls to unconditioned spaces or the outdoors caused by pressure differences across these openings due to wind, inside-outside temperature differences (stack effect), and imbalances between outdoor and exhaust airflow rates.

floor return: air removed from the space less than 4.5 ft (1.4 m) above the floor.

floor supply: air supplied to the space less than 4.5 ft (1.4m) above the floor.

hazardous materials: any biological, chemical, radiological, or physical item or agent that has the potential to cause harm to humans, animals, or the environment, either by itself or through interaction with other factors. Hazardous chemicals are any chemicals that are classified as a health hazard or simple asphyxiant, in accordance with the Hazard Communication Standard (29 CFR1910.1200), and any other particularly hazardous substances, including select carcinogens, reproductive toxins, and substances that have a high degree of acute toxicity. Hazardous biological agents are any pathogenic, allergenic, or toxigenic microorganisms, including BSL2-4 agents as defined in the National Institute for Health’s Biosafety in Microbiological and Biomedical Laboratories .

imaging room, Class 1: imaging rooms that meet the criterion of Class 1 as per the Facility Guidelines Institute (FGI) Guidelines for Design and Construction of Outpatient Facilities, Table 2.1-5.6.2.5.1.3.

industrial space: an indoor environment where the primary activity is production or manufacturing processes.

infiltration: uncontrolled inward air leakage to conditioned spaces through unintentional openings in ceilings, floors, and walls from unconditioned spaces or the outdoors caused by the same pressure differences that induce exfiltration.

mechanical ventilation: ventilation provided by mechanically powered equipment such as motor-driven fans and blowers but not by devices such as wind-driven turbine ventilators and mechanically operated windows.

microorganism: a microscopic organism, especially a bacterium, fungus, or protozoan.

natural ventilation: ventilation provided by thermal, wind, or diffusion effects through doors, windows, or other intentional openings in the building.

net occupiable area: floor area of an occupiable space defined by the inside surfaces of its walls but excluding shafts, column enclosures, and other permanently enclosed, inaccessible, and unoccupiable areas. Obstructions in the space, such as furnishings, display or storage racks, and other obstructions, whether temporary or permanent, are considered to be part of the net occupiable area.

nontransient: occupancy of a dwelling unit or sleeping unit for more than 30 days.

ANSI/ASHRAE Standard 62.1-2022 5