// CODE SNIPPET
Section 402 Natural Ventilation
JUMP TO FULL CODE CHAPTER
Natural ventilation of an
occupied space shall be through windows, doors, louvers or
other openings to the outdoors. The operating mechanism
for such openings shall be provided with ready access so
that the openings are readily controllable by the building
occupants.
The minimum openable area to the outdoors shall be 4 percent of the floor area being ventilated.
Where rooms and spaces
without openings to the outdoors are ventilated through an
adjoining room, the opening to the adjoining rooms shall be
unobstructed and shall have an area not less than 8 percent of
the floor area of the interior room or space, but not less than
25 square feet (2.3 m2). The minimum openable area to the
outdoors shall be based on the total floor area being ventilated.
Exception: Exterior openings required for ventilation
shall be permitted to open into a thermally isolated sunroom
addition or patio cover, provided that the openable area between the sunroom addition or patio cover and the
interior room has an area of not less than 8 percent of the
floor area of the interior room or space, but not less than
20 square feet (1.86 m2). The minimum openable area to
the outdoors shall be based on the total floor area being
ventilated.
Where openings below
grade provide required natural ventilation, the outside horizontal
clear space measured perpendicular to the opening
shall be one and one-half times the depth of the opening. The
depth of the opening shall be measured from the average
adjoining ground level to the bottom of the opening.
Related Code Sections
1203.5 Interior Environment, Natural Ventilation
Natural ventilation of an occupied
space shall be through windows, doors, louvers or other
openings to the outdoors. The operating mechanism ...
2015 Michigan Building Code > 12 Interior Environment > 1203 Ventilation > 1203.5 Natural Ventilation
304.5.1 General Regulations, Natural Ventilation
Indoor locations
intended for hydrogen-generating or refueling operations
shall be limited to a maximum floor area of 850 square
feet (79 m 2 ...
2015 Michigan Mechanical Code > 3 General Regulations > 304 Installation > 304.5 Hydrogen-Generating and Refueling Operations > 304.5.1 Natural Ventilation
Section 402 Ventilation, Natural Ventilation
Natural ventilation of an
occupied space shall be through windows, doors, louvers or
other openings to the outdoors. The operating mechanism ...
M1307.4.1 General Mechanical System Requirements, Natural Ventilation
Indoor locations
intended for hydrogen-generating or refueling operations
shall be limited to a maximum floor area of 850 square
feet (79 m 2 ...
2015 Michigan Residential Code > 13 General Mechanical System Requirements > M1307 Appliance Installation > M1307.4 Hydrogen Generating and Refueling Operations > M1307.4.1 Natural Ventilation
909.20.3 Fire Protection Systems, Natural Ventilation Alternative
The provisions
of Sections 909.20.3.1 through 909.20.3.3 shall apply to
ventilation of smokeproof enclosures by natural means ...
2015 Michigan Building Code > 9 Fire Protection Systems > 909 Smoke Control Systems > 909.20 Smokeproof Enclosures > 909.20.3 Natural Ventilation Alternative