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Random checks have revealed that the network cables at
Martingrove CI are generally of the correct fire rating.
According to Article 3.5.4.3 of the Ontario Building Code,
cables installed in any plenum (air duct) must be of an
FT6 rating meaning that they do not produce too much smoke
should they catch on fire. Smoke production is an important
factor because, in the case of a fire, the smoke could be
transported via the Heating, Ventilation, and Air Condition
(HVAC) system and distributed throughout the school - an
obviously undesirable scenario.
Initial inspections showed that all cables installed above
the ceiling tiles were rated at the FT6 level, however,
upon closer examination it was discovered that several cables
were rated at the FT4 level. The FT4 rating indicates that
the cable is not appropriate for plenum use as too much
smoke is generated upon combustion.
However, it was later determined by the MFP that the area
above the ceiling tiles in the hallway or in the classrooms
is not used as a ventilation duct. Therefore, the use of
FT6 plenum cable it is not necessary or required.
In a school with as few windows as Martingrove, compliance
to this regulation is especially important as the ventilation
system is the only source of fresh air - in a fire situation,
a room could easily fill with smoke making evacuation very
difficult.
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