3.6.5.1.(5)

Intent 1:

To exempt duct connectors that contain combustible materials from the requirements of Sentence 3.6.5.1.(1), which would otherwise require the connectors to be noncombustible, if certain conditions are met.

This is to limit the probability that the duct connectors will contribute to the growth or spread of fire, which could lead to the spread of fire by means of the air duct systems:

• to other parts of the building, which could lead to harm to persons, and
• from one fire compartment to another fire compartment, which could lead to harm to persons in the other fire compartment.