What is the role of Appendix M in ventilation design?

• A. It sets energy targets.
• B. It lists prohibited ventilation strategies.
• C. It provides informative guidelines based on default occupancy and zone air distribution effectiveness.
• D. It provides mandatory guidelines.

Answer: (C)

Appendix M provides informative guidance for applying the ventilation design rules by offering default assumptions for how many people are in a space and how effectively the zone air distributes the outdoor air to occupants. The idea is to use zone air distribution effectiveness (Ez) to account for how well the supplied air reaches occupants, along with default occupancy values, when site-specific data isn’t available. This makes the appendix a practical reference to help determine appropriate ventilation design decisions without imposing mandatory requirements. It’s not about setting energy targets, not about listing prohibited strategies, and it does not provide mandatory guidelines.