Maximum smoke developed classification of combustible insulation and coverings used on piping in buildings within the scope of Subsection 3.2.6.:

• of Group A, D, E or F major occupancy classification that are more than:
  • 36 m high, measured between grade and the floor level of the top storey, or
  • 18 m high, measured between grade and the floor level of the top storey, and in which the cumulative or total occupant load on or above any storey above grade, other than the first storey, divided by 1.8 times the width in metres of all exit stairs at that storey, exceeds 300,
• containing a Group B major occupancy in which the floor level of the highest storey of that major occupancy is more than 18 m above grade,
• containing a floor area or part of a floor area located above the third storey designed or intended as a Group B, Division 2 occupancy, and
• containing a Group C major occupancy whose floor level is more than 18 m above grade.

This also applies to the fire safety characteristics of heating, ventilating and air-conditioning systems, as stated in Article 6.2.1.2.

Exceptions: 

To limit the probability that combustible insulation and coverings used on piping in high buildings will have inappropriately high smoke-development properties, which could lead to the development of an inappropriate amount of smoke, which could lead to the spread of smoke to other parts of the building, which could lead to harm to persons.