416.1 An alarm system which is based on static pressure… — 2025 California Mechanical Code

416.1 An alarm system which is based on static pressure con- trol, volumetric control, or directional flow measurement shall be provided for each isolation room. The alarm system shall consist of a display monitor located on the corridor wall near the door to the room and a visual and audible alarm which

annunciates at the room and at a nurses' station or other suit- able location that will provide responsible surveillance. A time delay shall be provided to allow for routine openings of doors. The alarm shall annunciate when the supply, return, or exhaust fans are interrupted or when the minimum required pressure differential per ASHRAE 170 between the airborne infection isolation room and corridor or between the protec- tive environment room and corridor is not being met during closed door conditions.