ASHRAE-90.1-2022- - Page 006
Extracted Content
2.2 The provisions of this standard do not apply to
a. single-family houses and related incidental structures, multifamily structures of three stories or fewer
above grade, manufactured houses (mobile homes), and manufactured houses (modular) or b. buildings that use neither electricity nor fossil fuel .
2.3 Where specifically noted in this standard, certain other buildings or elements of buildings or sites shall be exempt.
2.4 This standard shall not be used to circumvent any safety, health, or environmental requirements.
3. DEFINITIONS, ABBREVIATIONS, AND ACRONYMS
3.1 General. Certain terms, abbreviations, and acronyms are defined in this section for the purposes of this standard. When the tense or plurality of the term is different than the defined term, the definition still applies. These definitions are applicable to all sections of this standard, wherever italicized . Terms that are not italicized shall have their ordinarily accepted meanings within the context in which they are used. Ordinarily accepted meanings shall be based on American standard English language usage as documented in an unabridged dictionary accepted by the adopting authority .
3.2 Definitions
above-grade wall: see wall .
access hatch: see door .
addition: an extension or increase in floor area or height of a building outside of the existing building enve- lope or the equipment or systems to a site .
adopting authority: the agency or agent that adopts this standard.
air economizer: see economizer, air .
air leakage: the uncontrolled airflow through the building envelope caused by pressure differences across the building envelope due to factors such as wind, inside and outside temperature differences, stack effect, and imbalance between supply and exhaust air systems . Air leakage can move inward (infiltration) or outward (exfiltration) through the building envelope .
air system balancing: see balancing, air system .
alteration: replacing or adding to systems, equipment, structures, or building assemblies; routine maintenance, repair, and service, or a change in the building or structure use classification or space conditioning category shall not constitute an alteration .
annual fuel utilization efficiency (AFUE): an efficiency descriptor of the ratio of annual output energy to annual input energy as developed in accordance with the requirements of U.S. Department of Energy (DOE) 10 CFR Part 430.
attic and other roofs: see roof .
authority having jurisdiction: the agency or agent responsible for enforcing this standard.
automatic or automatically: self-acting, operating by its own mechanism when actuated by some nonmanual influence, such as a change in current strength, pressure, temperature, or mechanical configuration.
automatic control device: a device capable of automatically turning loads off and on without manual intervention.
balancing, air system: adjusting airflow rates through air distribution system devices, such as fans and diffusers, by manually adjusting the position of dampers, splitter vanes, extractors, etc., or by using automatic control devices such as constant-air-volume or variable-air-volume (VAV) boxes.
balancing, hydronic system: adjusting water flow rates through hydronic distribution system devices, such as pumps and coils, by manually adjusting the position valves or by using automatic control devices such as automatic flow control valves.
ballast: a device used in conjunction with an electric-discharge lamp to cause the lamp to start and operate under the proper circuit conditions of voltage, current, wave form, electrode heat, etc.
baseline building design: a computer representation of a hypothetical design based on the proposed design . This representation is used as the basis for calculating the baseline building performance for rating abovestandard design or when using the Performance Rating Method as an alternative path for minimum standard compliance in accordance with Section 4.2.1.1.
4 ANSI/ASHRAE/IES Standard 90.1-2022 (I-P)