Back9.18.7.1.(4)

ATTRIBUTION:

Functional Statement:

F01

To minimize the risk of accidental ignition.

Objective:

OS1.1

 

APPLICATION:

Noncombustible register protection for crawl spaces whose exterior walls have less than 25% of their total area above exterior ground level open to the outdoors, that are under 1-storey portions of dwelling units and are used as warm-air plenums, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].

INTENT:

To limit the probability that debris, such as smouldering cigarette butts, will fall through the floor register outside the protected area and lead to the ignition of combustible materials in the crawl space plenum, which could lead to harm to persons.