ASHRAE STD 62.1
Ventilation for Acceptable Indoor Air Quality
|Publication Date:||26 June 2019|
Table 126.96.36.199, "Minimum Ventilation Rates in Breathing Zone," includes educational space types, including "Classroom (age 9 plus)" and "Lecture classroom." The first of these does not have note H assigned, and ventilation shutoff is not allowed. Lecture classroom has note H assigned, and ventilation shutoff is allowed. However, for college buildings, it is not clear which of these space types should be assigned to the classroom spaces. This addendum will clarify that college classrooms may use note H and have the ventilation shut off when they are unoccupied. This control type would also apply to other postsecondary classrooms, such as classrooms that are in a variety of building types, including classrooms in office buildings.
The rationale for combining lecture halls and postsecondary classrooms is that these are areas where room-generated emissions are small-they typically have hard surfaces and do not include painting supplies etc. Note that Table 188.8.131.52 has different space types specifically called out for other classroom spaces that might contain materials that off-gas regardless of level of occupancy. These include daycare, classrooms for younger students, art classrooms, science laboratories, wood/metal shop, etc.
Note: In this addendum, changes to the current standard are indicated in the text by underlining (for additions) and (for deletions) unless the instructions specifically mention some other means of indicating the changes.