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The ASHE CMS State Operations Manual Appendix A Crosswalk provides A-Tag information along with the related codes and standards applicable to the requirements for each A-Tag. To ensure that the tool is relevant to health care facility professionals, it focuses specifically on A-Tag requirements that affect the physical environment.

A building’s HVAC system is designed to perform several tasks: filter, cool, heat, humidify, dehumidify, pressurize, and/or exhaust. Each of these tasks affects indoor air quality. For example, if incom­ing air is not properly filtered, excessive dust from the outdoors is drawn into the building. If supplied air is not conditioned or heated satisfactorily, occupants may experience thermal discomfort. If supplied air is not dehumidified appropriately, excessive relative humidity levels may promote microbial growth.