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once stop such work and to order all persons engaged therein to stop and desist therefrom. Such work shall not be resumed until satisfactory assurance has been given the commissioner of buildings or the commissioner of health that it will be done according to the approved plans or until said commissioner of buildings or commissioner of health has consented, in writing, to the changes made in such approved plans, in either of which cases a new permit must be issued before the work proceeds, for which permit the usual fee shall be paid by the contractor doing such work.

(c) No contractor or builder shall begin any work on any building or structure for which a permit is required until such permit shall have been secured. In case any work is begun on the erection, alteration, repair or removal of any building or structure without a permit authorizing the same being issued therefor, the commissioner of buildings and his assistants shall have power to at once stop such work and to order any and all persons engaged therein to stop and desist therefrom until the proper permit is secured.

ARTICLE III

CLASSIFICATION OF BUILDINGS

+240. Buildings-class of.] (a) All buildings other than sheds. and shelter sheds as hereafter described, now existing or hereafter erected, altered or enlarged, shall be classified as follows:

(b) Class I.] In Class I shall be included every building other than department stores as described in this chapter, used for the sale, storage, or manufacture of merchandise, and every stable or garage having a ground area of 500 square feet or over.

(c) Class II.] In Class II shall be included every building referred to in subdivisions Class IIa, Class IIb and Class IIc.

(d) In Class IIa shall be included every building used for office purposes, and also every building used for clubhouse purposes where sleeping accommodations are provided for less than twenty persons.

(e) In Class IIb shall be included every building used for hotel, club, lodging or rooming house purposes where such building has sleeping accommodations for twenty or more persons.

(f) In Class IIe shall be included every building used for a hospital, home for the aged and decrepit, for housing the sick and infirm, imbeciles or children, house of correction or detention, jail or asylum, where any such building shall have sleeping accommodations for more than ten persons.

(g) Class III.] In Class III shall be included every building used as a family residence, and also every building used for garage or stabling purposes, and having a ground area of less than 500 square feet.

(h) Class IV.] In Class IV shall be included every building referred to in subdivisions Class IVa, Class IVb, Class IVc, and Class IVd, as follows:

As amended May 17, 1915, and May 8, 1916.

(i) In Class IVa shall be included every building used as a church or place of worship.

(j) In Class IVb shall be included every building having a parish hall, lodge hall, dance hall, banquet hall, skating rink, assembly hall, halls used for the purpose of exposition and exhibition, and buildings having a hall for the purpose of instruction other than schools, included in Class VIII, and also every existing building having a hall used for theatrical purposes at the time of the passage of this ordinance, except such buildings as are included in Classes IVa, IVc, IVd, and V.

(k) In Class IVe shall be included every building hereafter erected used for moving picture and vaudeville shows and similar entertainments, where an admission fee is charged and regular performances are given, and where the seating capacity does not exceed three hundred, provided, that every building of Class IVe existing at the time of the passage of this ordinance shall comply with the provisions of Class IVb. (1) In Class IVd shall be included every grandstand and every baseball, athletic and amusement park.

(m) Class V.] In Class V shall be included every building which is used as a public theatre where an admission fee is charged and in which movable scenery is used, and every assembly hall hereafter erected having a seating capacity of over 300 and containing a permanent stage on which scenery and theatrical apparatus are used and regular theatrical vaudeville performances are given; provided, however, that public halls and club halls with a seating capacity of less than 600, although occasionally used for theatrical presentations, shall not be construed to be public theaters within the meaning of the term as used in this section, notwithstanding the fact that movable scenery is used upon the stages thereof on such occasions, and such public halls and club halls shall not be considered as buildings of Class V as herein defined. Such public halls and club halls shall be included in Class IVb, as defined in this section.

(n) Class VI.] In Class VI shall be included every tenement and apartment house or building or portion thereof which is used or intended to be used as a home or residence for two or more families living in separate apartments.

(0) Class VII.] In Class VII shall be included every building used for the sale at retail of dry goods and other articles of general merchandise and commonly known and described as a department store.

(p) Class VIII.] In Class VIII shall be included every building used for school purposes and every building containing class rooms for special or general instruction, other than halls for the purpose of instruction as included in Class IV, where such building so used shall have a seating capacity of more than fifty students.

*(q) Class IX.] In Class IX shall be included every building main-tained by the city of Chicago for police station purposes.

(r) Requirements with regard to buildings not within any of the above classes shall be determined by the commissioner of buildings, subject to arbitration in the same manner as provided in sections 206 and 207 of this chapter.

* New paragraph, added May 8, 1916.

241. Buildings used for the purposes of more than one class.] Where any building is used for the purposes of two or more classes, as herein specified, and defined, such portion of any such building as is devoted to the uses and purposes of any particular class shall be constructed, operated and maintained in accordance with the requirements of this chapter relating to such class, unless such construction shall, in the opinion of the commissioner of buildings, prove impracticable, or unless there would be a conflict between the provisions of this chapter relating to the construction of buildings, in either of which cases the provisions which relate to and govern the construction of buildings of the class requiring the best and safest form of construction shall govern the entire building.

242. Conflict between special and general provisions.] Whenever any provision or requirement of this chapter relating specifically to the construction, equipment, maintenance, or operation of any building or part of a building used for the purposes of any specified class, shall conflict with the general provisions of this chapter relating to the construction, equipment, maintenance and operation of buildings generally, the special provisions shall govern in each case, except in the case of section 514, which shall govern in all cases coming within its provisions.

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243. Class I defined.] In Class I shall be included every building other than department stores, as described in this chapter, used for the sale, storage, or manufacture of merchandise, and every stable or garage having a ground area of 500 square feet or over.

ARTICLE V

CLASS II

*254. Class II defined.] (a) In Class II shall be included every building referred to in subdivisions Class IIa, Class IIb and Class IIc. (b) In Class IIa shall be included every building used for office purposes, and also every building used for clubhouse purposes where sleeping accommodations are provided for less than twenty persons.

(c) In Class IIb shall be included every building used for hotel, club, lodging or rooming house purposes where such building has sleeping accommodations for twenty or more persons.

(d) In Class IIc shall be included every building used for a hospital, home for the aged and decrepit, for housing the sick and infirm, imbeciles or children, house of correction or detention, jail or asylum, where any such building shall have sleeping accommodations for more than ten persons.

* As amended May 8, 1916.

2542. Must comply with general and special provisions.] Every building of Class II shall comply with the general provisions of this chapter, and in addition to the general provisions shall comply with the following special provisions:

255. Allowance for live loads in construction of floors of Class II.] For all buildings of Class II the floors shall be designed and constructed in such a manner as to be capable of bearing in all their parts, in addition to the weight of floor construction, partitions, permanent fixtures and mechanisms that may be set upon the same, a live load of fifty pounds for every square foot of surface, and such live load shall be computed in accordance with the provisions of this chapter.

256. Windows and mechanical ventilation.] (a) In every building hereafter erected for or converted to the purposes of this class, courts shall be of the minimum widths and areas prescribed in section 442 of this chapter, and vent shafts as defined in section 432 of this chapter, shall be of the following minimum width and areas:

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(b) In every building hereafter erected for or converted to the purposes of this class, every room used as a private sitting room or as a sleeping room, shall have at least one window which opens directly upon a street, alley, yard or court. The total glass area of such window or windows opening directly upon a street, alley, yard or court shall be not less than one-tenth of the floor area of such room. The top of at least one such window shall be at least seven feet above the floor and at least the upper half of such window shall be capable of being opened. No such window shall have a glass area of less than ten square feet unless it be a window in excess of the one-tenth of the floor area as required by this paragraph. Provided that sleeping cells in prisons, jails, police stations and houses of detention need not have each a window opening directly on a street, alley, yard or court if such cells are in a cell block which has windows with a glass area equal to one-fourth of the floor area of such block and arranged so that each window may be opened for one-half of its area, and provided further that such cell block and cells shall be equipped with a system of mechanical ventilation approved by the commissioner of health.

(c) In every building hereafter erected for or converted to the purposes of this class, every pantry, bathroom and water closet and urinal compartment shall have at least one window which opens directly upon a street, alley, yard, court or vent shaft; the total glass area of such window or windows opening directly upon a street, alley, yard, court or vent shaft shall be not less than one-tenth of the floor area

of such room or compartment. The top of at least one such window shall be at least seven feet above the floor and at least the upper half of such window shall be capable of being opened; and no such window shall have a glass area of less than six square feet or a glass width of less than one foot; provided, however, that such room or compartment, if located in the upper story of any such building, may be lighted and ventilated by means of a skylight having a glass area equal to one-tenth of the floor area of the room it serves and be equipped with an efficient .ventilator or ventilators equal in effective area to one-twentieth of the floor area of such room; and provided further, that any such room or compartment in a building used for office, club or hotel purposes, in lieu of such window or windows, may be ventilated by an approved mechanical ventilating system which shall effect at least six complete changes of air per hour.

(d) In every building hereafter erected for or converted to office, hotel or club purposes, every room, except a room used as a bakery, which is below street grade and which is frequented by the public or in which there are regularly employed five or more persons, shall be ventilated by an approved mechanical ventilating system which shall effect at least six complete changes of air per hour; provided that in case of store rooms below street grade having 1,500 cubic feet of space per person employed therein, two changes of air per hour will be deemed sufficient. In buildings of this class every room, either above or below grade, used as a bakery, shall comply with the provisions of the ordinances of the city of Chicago in respect to bakeries.

(e) In every building hereafter erected for or converted to the purposes of this class, every room not otherwise specifically provided for in this section shall, where practicable, have a window or windows, with a total glass area not less than one-tenth of the floor area of such room, opening directly on to a street, alley, yard or court, and no such window shall have a width of less than one foot or a total glass area of less than ten square feet, unless such window is in excess of the ten per cent of floor area requirement; provided that, if it be impracticable to ventilate any such room by windows as aforesaid, such rooms shall be ventilated by an approved mechanical ventilating system which shall effect at least six complete changes of air per hour; the air supply being taken from the outer air at a point not less than ten feet above the street level.

(f) It shall be the duty of the owner, agent, architect, or party in possession or control of any building in which a mechanical system of ventilation shall have been installed under the requirements of this section, upon completion of such system, to notify the commissioner of health in writing at least twenty-four hours in advance of the making of a test of such system; and each such system or unit shall be tested for volumetric efficiency by the owner or his representative in the presence of the representative of the commissioner of health and such system shall not be considered as meeting the requirements of this section until it shall have been approved by the commissioner of health. Every such mechanical ventilating system shall at all times be kept in good repair and in operation so as to insure the required ventilation all hours of human occupancy.

of all rooms and compartments planned to be ventilated thereby, during

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