Previously published as AAP:
ISO 7730:2005 and/or CEN Standard EN 15251:2007 may be used in lieu of ASHRAE 55-2003 Sections 5.3 and 5.4. The requirements of these standards must be met in all spaces, rather than 75% of regularly occupied spaces in the project. When selecting either ISO 7730:2005 or CEN Standard EN 15251:2007, the most appropriate standard must be selected for the space. Note that some naturally ventilated spaces may not qualify to use CEN Standard EN 15251:2007 if certain criteria are not met.

In addition, when utilizing CEN Standard EN 15251:2007, the project must comply with either Category I or Category II as described in Table A.1 of the standard in order to be within +/- 0.5 of the PMV for the space.