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// CODE SNIPPET

1202.5 Natural Ventilation

Building Code 2018 of Illinois > 12 Interior Environment > 1202 Ventilation > 1202.5 Natural Ventilation

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ILLUSTRATION

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.

1202.5.1 Ventilation Area Required

The openable area of the openings to the outdoors shall be not less than 4 percent of the floor area being ventilated.

1202.5.1.1 Adjoining Spaces

ILLUSTRATION

Where rooms and spaces without openings to the outdoors are ventilated through an adjoining room, the opening to the adjoining room shall be unobstructed and shall have an area of 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 openable area of the openings to the outdoors shall be based on the total floor area being ventilated.

Exception: Exterior openings required for ventilation shall be allowed to open into a sunroom with thermal isolation or a patio cover provided that the openable area between the sunroom addition or patio cover and the interior room shall have 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 openable area of the openings to the outdoors shall be based on the total floor area being ventilated.

1202.5.1.2 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.

1202.5.2 Contaminants Exhausted

Contaminant sources in naturally ventilated spaces shall be removed in accordance with the International Mechanical Code and the International Fire Code.

1202.5.2.1 Bathrooms

Rooms containing bathtubs, showers, spas and similar bathing fixtures shall be mechanically ventilated in accordance with the International Mechanical Code.

1202.5.3 Openings on Yards or Courts

Where natural ventilation is to be provided by openings onto yards or courts, such yards or courts shall comply with Section 1205.

Related Code Sections

1202.5 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 ...

Building Code 2018 of Illinois > 12 Interior Environment > 1202 Ventilation > 1202.5 Natural Ventilation

909.20.3 Fire Protection and Life Safety 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 ...

Building Code 2018 of Illinois > 9 Fire Protection and Life Safety Systems > 909 Smoke Control Systems > 909.20 Smokeproof Enclosures > 909.20.3 Natural Ventilation Alternative

1202.5.2.1 Interior Environment, Bathrooms

Rooms containing bathtubs, showers, spas and similar bathing fixtures shall be mechanically ventilated in accordance with the International ...

Building Code 2018 of Illinois > 12 Interior Environment > 1202 Ventilation > 1202.5 Natural Ventilation > 1202.5.2 Contaminants Exhausted > 1202.5.2.1 Bathrooms

909.20.3.3 Fire Protection and Life Safety Systems, Vestibule Ventilation

Each vestibule shall have a minimum net area of 16 square feet (1.5 m 2 ) of opening in a wall facing an outer court, yard or public way ...

Building Code 2018 of Illinois > 9 Fire Protection and Life Safety Systems > 909 Smoke Control Systems > 909.20 Smokeproof Enclosures > 909.20.3 Natural Ventilation Alternative > 909.20.3.3 Vestibule Ventilation

909.20.3.1 Fire Protection and Life Safety Systems, Balcony Doors

Where access to the stairway or ramp is by way of an open exterior balcony, the door assembly into the enclosure shall be a fire door assembly ...

Building Code 2018 of Illinois > 9 Fire Protection and Life Safety Systems > 909 Smoke Control Systems > 909.20 Smokeproof Enclosures > 909.20.3 Natural Ventilation Alternative > 909.20.3.1 Balcony Doors

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