(A) No laundry shall be operated in any cellar, basement, or in any other room or place which is not provided with sufficient natural light by means of windows or skylights so that on clear days during the period between one hour after sunrise and two hours before sunset illuminmeter tests show a minimum illumination of five footcandles in all parts of the room or place not directly obstructed by machinery or other equipment. The general arrangement of all machinery and equipment shall be such as not to unnecessarily obstruct the lighting and ventilating through the windows and skylights.
(B) No laundry shall be operated in any room or place in which the clear height between the ceiling and the finished floor is less than ten feet, or which is not ventilated by means of windows, skylights, air shafts, air ducts, or mechanical apparatus so that a complete change of air in all parts of the room or place may be made at least four times each hour. In every room or place at least 1,000 cubic feet of air space shall be provided for each person employed therein.
(C) Every room in any laundry, except rooms used for drying purposes, in which the temperature and humidity are such as to endanger the health of the persons employed therein, shall be provided with a mechanical ventilating system approved by the health officer.
('68 Code, §§ 45.03, 45.06)