550
Laws and Regulations: Codes
perimeter, suggest a more positive use of the HVC system during a fire
than is possible with more conventional arrangements. For example, it
may not be necessary to shut down return air throughout the building, but
only in the area of escape. Adjacent areas of refuge might be
automatically pressurized to prevent spread of smoke, while the exhaust
rate within the affected module is boosted. These special modes are not
required by the Prototype Design, they are merely provided as alternatives
when a particular strategy is being developed.
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