Minn. R. 1305.0919 - SECTION 919, POST-FIRE EXHAUST SYSTEM
IBC chapter 9 is amended by adding a section to read as follows:
SECTION 919
POST-FIRE SMOKE EXHAUST SYSTEM
919.1
Scope and purpose. This
section applies to post-fire smoke exhaust systems when they are required by
other provisions of this code. The purpose of this section is to establish
minimum requirements for the design and installation of smoke exhaust systems
that are intended for the timely restoration of operations and overhaul
activities once a fire is extinguished.
919.2
General design requirements.
Post-fire smoke exhaust systems are not intended or designed as life
safety systems and are not required to meet the provisions of Section 909.
These systems are permitted to use dedicated equipment, the normal building
HVAC system or other openings and shall have the capability to exhaust smoke
from occupied spaces. Smoke removal may be by either mechanical or natural
ventilation, but shall be capable of removing cold smoke. Smoke exhaust shall
be permitted through elevator shafts. Smoke removed from a space shall be
discharged to a safe location outside the building and may not be recirculated
into the building in accordance with the Minnesota Mechanical Code.
919.3
Exhaust capability. The
system shall have an air supply and smoke exhaust capability that will provide
a minimum of three air changes per hour or remove smoke to less than a 5
percent concentration within one hour of operation. The system does not need to
exhaust from all areas at the same time, but is permitted to be zoned based on
the largest fire area served. For the purpose of calculating system size, the
height of a compartment shall be considered to run from slab to slab and
include the volume above suspended ceilings.
919.4
Operation. The smoke
exhaust system shall be operated by manual controls that are readily accessible
to the fire department at an approved location and shall incorporate an
approved control diagram. When a system is zoned into areas of operation less
than the entire building, each zone shall have an individual control. Fire
department manual controls of post-fire smoke exhaust systems shall have the
highest priority of any control point within the building. Smoke exhaust shall
not be permitted through any exit enclosure as defined in Section
1002.
919.5
Inspection and
testing. Post-fire smoke exhaust systems shall be inspected and tested
annually.
Notes
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