What is an addendum in the context of ASHRAE Standard 62.1-2022?

• A. A commentary document not affecting requirements.
• B. A temporary suspension of requirements during maintenance.
• C. A new edition of the standard released every five years.
• D. A modification to the published standard issued as a separate document under continuous maintenance.

Answer: (D)

An addendum is a modification to the published standard issued as a separate document under continuous maintenance. It updates or clarifies specific requirements between full editions, and once approved, it becomes part of the standard. This keeps the standard current as new knowledge and technology emerge.

That’s why this description fits best: it describes a targeted change that is issued separately and can modify the standard’s requirements between editions. It’s not simply a non-binding commentary, nor a temporary suspension during maintenance, and it isn’t describing the edition cycle (a new edition every five years).