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// CODE SNIPPET

Section 402 Natural Ventilation

2015 Michigan Mechanical Code > 4 Ventilation > 402 Natural Ventilation
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[BG] 402.1 Natural Ventilation

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.

[BG] 402.2 Ventilation Area Required

The minimum openable area to the outdoors shall be 4 percent of the floor area being ventilated.

[BG] 402.3 Adjoining Spaces

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.

[BG] 402.4 Openings Below Grade

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 ...
2015 Michigan Mechanical Code > 4 Ventilation > 402 Natural Ventilation
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
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