606.0 Ventilating Ceilings

Perforated ceilings shall be permitted to be used for air supply within the limitations of this section. Exit corridors, where required to be of fire-resistive construction by the building code, shall not have ventilating ceilings.

Ventilating ceilings shall comply with the following:

1. Suspended ventilating ceiling material shall have a Class 1 flame spread classification on both sides, determined in accordance with the building code. Suspended ventilating ceiling supports shall be of noncombustible materials.
2. Lighting fixtures recessed into ventilating ceilings shall be of a type approved for that purpose.