Current through Register Vol. 49, No. 13, September 23, 2024
401.4
Opening location. Outside
air exhaust and intake openings, in buildings other than dwellings and Group
R-3 occupancies, shall be located a minimum of 10 feet (3048 mm) from lot lines
or buildings on the same lot. Where openings front on a street or public way,
the distance shall be measured to the centerline of the street or public way.
401.4.1
Intake openings.
Mechanical outside air intake openings shall be located a minimum of 10 feet
(3048 mm) from any hazardous or noxious contaminant, such as chimneys, plumbing
vents, streets, alleys, parking lots, and loading docks, except as otherwise
specified in this code. Where a source of contaminant is located within 10 feet
(3048 mm) of an intake opening, the intake opening shall be located a minimum
of 3 feet (914 mm) below the contaminant source, unless the intake opening is a
combustion air intake of a direct-vent appliance.
401.4.2
Exhaust openings.
Outside exhaust openings, including bathroom exhaust, toilet exhaust, domestic
kitchen range exhaust, and domestic clothes dryer exhaust, shall be located at
least 3 feet (914 mm) from doors, operable windows, and nonmechanical intake
openings. Exhaust air shall not be directed onto public walkways.
401.4.3
Flood hazard. For
structures located in flood hazard areas, outdoor exhaust openings shall be at
or above the design flood elevation.
401.4.4
Venting system
terminations. Venting system terminations shall comply with IMC Section
804 and IFGC Section 503.8.
Subpart
1.
Section 401.2.
IMC section 401.2, Ventilation required, is amended and
subsections added to read as follows:
401.2
Ventilation required.
Every occupied space other than buildings constructed in accordance with the
IRC and Group R-2, R-3, and R-4 occupancies three stories and less in height
shall be ventilated by natural means in accordance with section 402 or by
mechanical ventilation in accordance with section 403. Ambulatory care
facilities and Group I-2 occupancies shall be ventilated by mechanical means in
accordance with section 407.
401.2.1
Ventilation in IRC buildings.
Ventilation in buildings constructed in accordance with the
IRC shall comply with Minnesota Rules, chapter 1322.
401.2.2
Ventilation in Group R-2, R-3,
and R-4 occupancies three stories and less in height. Ventilation in
Group R-2, R-3, and R-4 occupancies three stories and less in height shall be
provided with a balanced ventilation system and shall comply with the fan
efcacy requirements located in Minnesota Rules, chapter 1322, and the
ventilation requirements in (1) Minnesota Rules, chapter 1322, or (2) ASHRAE
62.2 Ventilation and Acceptable Indoor Air Quality in Residential
Buildings.
401.2.3
Ventilation in Group R-2, R-3, and R-4 occupancies more than three
stories in height. Ventilation in Group R-2, R-3, and R-4 occupancies
more than three stories in height above grade plane shall comply with
ventilation requirements of section 402, section 403, or ASHRAE 62.2
Ventilation and Acceptable Indoor Air Quality in Residential
Buildings.
Subp. 2.
Section
401.4.
IMC section 401.4 is amended to read as follows:
Air intake openings shall comply with all of the
following:
A. Intake openings shall be
located a minimum of 10 feet (3,048 mm) from lot lines or buildings on the same
lot. Intake openings that front on a street or public way must be located a
minimum of 10 feet (3,048 mm) horizontally from the centerline of the street or
public way.
B. Mechanical outdoor
air intake openings shall be located a minimum of 10 feet (3,048 mm) from any
hazardous or noxious contaminant, such as chimneys, plumbing vents, streets,
alleys, parking lots, and loading docks, except as specified in item C or
section 501.3.1. Outdoor air intake openings shall be permitted to be located
less than 10 feet (3,048 mm) horizontally from streets, alleys, parking lots,
and loading docks provided that the openings are located not less than 25 feet
(7,620 mm) vertically above such locations. Where openings front on a street or
public way, the distance shall be measured to the centerline of the street or
public way.
C. Intake openings
shall be located not less than 3 feet (914 mm) below contaminant sources where
such sources are located within 10 feet (3,048 mm) of the opening.
