Minn. R. 1346.0607 - SECTION 607, DUCT AND TRANSFER OPENINGS
IMC section 607.6.1 is amended to read as follows:
607.6.1
Through penetrations.
In occupancies other than Group I-2 and I-3, a duct constructed of
approved materials in accordance with this code that penetrates a
fire-resistance-rated floor or floor/ceiling assembly that connects not more
than two stories is permitted without a shaft enclosure protection, provided a
listed fire damper is installed at the floor line or the duct is protected in
accordance with IBC section 714.4, as amended. For air transfer openings, see
IBC section 712.1.8, as amended.
Exceptions:
1. A duct is permitted to penetrate three
floors or less without a fire damper at each floor, provided such duct meets
all of the following requirements:
a. The
duct shall be contained and located within the cavity of a wall and shall be
constructed of steel having a minimum wall thickness of 0.0187 inches (0.4712
mm) (No. 26 gage) or the duct shall be protected by an approved
through-penetration firestop system installed and tested in accordance with
ASTM E 814 or UL 1479. The approved through-penetration firestop system shall
have an F rating or T rating of not less than the required rating of the
horizontal assembly being penetrated.
b. The duct shall open into only one dwelling
unit or sleeping unit and the duct system shall be continuous from the unit to
the exterior of the building.
c.
The duct shall not exceed 4-inch (102 mm) nominal diameter and the total area
of such ducts shall not exceed 100 square inches (0.065
m2) in any 100 square feet (64,516
mm2 per 9.3 m2) of the
floor area.
d. The annular space
around the duct is protected with materials that prevent the passage of flame
and hot gases sufficient to ignite cotton waste where subjected to ASTM E 119
or UL 263 time-temperature conditions under a minimum positive pressure
differential of 0.01 inch (2.49 Pa) of water at the location of the penetration
for the time period equivalent to the fire-resistance rating of the
construction penetrated.
e. Grille
openings located in a ceiling of a fire-resistance-rated floor/ceiling or
roof/ceiling assembly shall be protected with a listed ceiling radiation damper
installed in accordance with IBC section 717.6.2.1, as amended.
2. In Group I-2 and I-3
occupancies, a duct constructed of approved materials in accordance with this
code that penetrates a fire-resistance-rated floor or floor/ceiling assembly
that connects not more than two stories is permitted without a shaft enclosure
protection, if a listed smoke/fire damper is installed at the floor
line.
Notes
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No prior version found.