ASHRAE+62.1-2022+(1) - Page 055

Extracted Content

b. Because of the many other factors that might affect occupant perception and acceptance of IAQ, such

as air temperature, humidity, noise, lighting, and psychological stress c. Because of the range of susceptibility in the population d. Because outdoor air brought into the building might be unacceptable or might not be adequately

cleaned

(The following section provides suggested model code language.)

APPLICATION AND COMPLIANCE

Application

New Buildings. All sections and normative appendices apply to new buildings falling within the scope of this standard.

Existing Buildings

Additions to Existing Buildings. All additions to existing buildings within the scope of this standard shall meet the requirements of all sections and normative appendices. Exception: When an existing ventilation system is extended to serve an addition, the existing system compo-

nents, such as fans and cooling and heating equipment, need not meet the requirements of this standard. However, the extended existing system must remain in compliance with ventilation codes and standards that were in effect at the time it was permitted for construction.

Repairs. Repairing (making operational) existing equipment or other building components shall be allowed without requiring the building or any of its components to comply with this standard. Replacement. Any component of a building that is removed and replaced shall meet the applicable require- ments of Section 5, “Systems and Equipment,” of this standard for that component. Unaltered components are not required to be brought into compliance except as required due to a change in use. Exception: Replacement of a building component or individual piece of equipment with a component of like

size and kind, provided that all requirements of codes effective at the time of original system design and installation are met. For example, replacement of an air-conditioning unit with one of similar capacity would not require that the ventilation rate requirements and other requirements of this standard be met.

Substantial Alterations. If a building is substantially altered, all sections and normative appendices of this standard shall be met as if the building were new. A building shall be considered substantially altered if the cost of the revisions exceeds 50% of the building’s fair market value, excluding the cost of compliance with all sections and normative appendices of this standard. Change in Use. If the space application category as listed in Table 2 changes, such as from office to retail, the minimum ventilation rates required by Section 6, “Procedures,” shall be met for that space.

Compliance

Demonstrating that acceptable IAQ has been achieved, such as by measuring contaminant concentrations or surveying occupants, is not required by this standard except where required by the IAQ Procedure.

ANSI/ASHRAE Standard 62.1-2022 53