Chapter 11, Section 1107.6, is hereby deleted in its entirety and the following provision shall be substituted therefor:

Emergency Control of the Ventilation Systems – Fans required by Section 1107.2 to provide emergency purge ventilation shall be activated by refrigerant Alarm 1 in accordance with Section 1106.4 and by a clearly identified switch of the break-glass type, or protected by an approved tamper resistant cover located immediately adjacent to and outside of the principal refrigerant machinery room entrance. Two colored and labeled indicator lamps responding to the differential pressure across the purge fan shall be provided for each switch. One lamp shall indicate flow; the other shall indicate no flow.