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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.

Positive vs Negative Operating room and protective isolation = Positive Airborne isolation = Negative When the total CFM from supply air (1&2) > than the return air (3), the room is under positive pressure and the air will flow out of the room. When the CFM from the return air (3) > than the supply air (1&2), the room is under negative pressure and the air will flow into the room