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The total number of occupants shall be the occupant load determined in accordance with Section 1004 of the Chicago Building Code provided that such number may be reduced based on nonsimultaneous occupancy or access controls. Where separate facilities for each sex are required by Section 18-29-403.2 or the number of occupants of each sex is required by Table 18-29-403.1, the number of male occupants and the number of female occupants shall be the total number of occupants divided in half. Where the calculated number of male occupants is not a whole number, it shall be rounded down to the next whole number, and the calculated number of female occupants shall be rounded up to the next whole number so that the sum of male occupants and female occupants is equal to the total number of occupants.
Exceptions:
1. The total number of occupants shall not be required to be divided in half where approved statistical data indicate a distribution of the sexes of other than 50 percent of each sex. In such case, the total number of occupants shall be divided based on the approved statistical data.
2. Where a ratio is based on the number of care recipients, detainees or employees in a facility, the number shall be determined in accordance with Table 18-29-403.1, footnote c.
3. In mercantile occupancies with 7,500 square feet (697 m
2
) or more of gross floor area, the number of occupants shall be determined by dividing the net floor area used by the public or 25 percent of the gross floor area, whichever is smaller, by 100.
(Added Coun. J. 10-14-21, p. 37722, Art. IV, § 6)
To determine the required number of fixtures, the fixture ratio or ratios for each fixture type shall be applied to the number of occupants or the number of occupants of each sex in accordance with Table 18-29-403.1. Fractional numbers resulting from applying the fixture ratios of Table 18-29-403.1 shall be rounded up to the next whole number. For calculations involving multiple use classifications, the fractional numbers for each use shall first be summed and then rounded up to the next whole number.
Exception: One single-user toilet room in accordance with Section 18-29-403.1.3 shall be acceptable for a building or tenant space with an occupant load of 30 or fewer.
(Added Coun. J. 10-14-21, p. 37722, Art. IV, § 6)
Plumbing fixtures located in single-user toilet rooms and single-user bathing rooms, including family or assisted-use toilet rooms and bathing rooms required by Section 1109.2.1 of the Chicago Building Code, that comply with Sections 18-29-403.1.3.1 through 18-29-403.1.3.3 shall be included when determining whether the required number of plumbing fixtures is provided for a building or tenant space. Where the required number of plumbing fixtures for a building or tenant space is provided through a combination of single-user and separate facilities, the number of fixtures required in separate facilities for each sex shall be reduced proportionally.
Exceptions: Single-user toilet rooms and bathing rooms shall not be required to comply with Sections 18-29-403.1.3.1 through 18-29-403.1.3.4 where:
1. Located within a dwelling unit or sleeping unit.
2. Located within a Group E-2 or I occupancy and intended for use by care recipients or detainees.
(Added Coun. J. 10-14-21, p. 37722, Art. IV, § 6)
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