72. Shelters, Rest Rooms and Lunch Rooms.- The shelters, or rest rooms and lunch rooms shall confirm to the following standards and the Manager of a factory shall submit for the approval of the Chief Inspector a site p Ian in duplicate of the building to be so constructed or adopted- (a) The building shall be soundly constructed and all the walls and roof shall be of suitable heat resisting materials and shall be waterproof. The floor and walls to a heigh t of 3 feet shall be so laid or finished to provide a smooth, hard and impervious surface. (b) The height of every room in the building shall be not less than 12 feet from floor level to the lowest part of the roof and there shall be at least 12 square feet of floor area for every person employed. Provided that (i) workers who habitually go home for their meals during the rest periods may be excluded in calculating the number of workers to be accommodated; and (ii) in the case of factories in existence at the date of commencement of the Act, where it is impracticable, owing to lack of space to provide 12 square feet of floor area for each person, such reduced floor area per person shall be provided as may be provided in writing by the Chief Inspector. (c) Effective and suitable provision shall be made in every room for securing and maintaining adequate ventilation by the circulation of fresh air and there shall also be provided and maintained sufficient and suitable natural or artificial lighting. (d) Every room shall be adequately furnished with chairs or benches with back-rests. (e) Sweepers shall be employed whose primary duty is to keep the rooms, building and precincts thereof in a clean and tidy condition. | 
