122 Ventilation. Lighting. Drainage o floors, Sanitary con- veniences. Enforcement by the local health authority of certain provisions of Part IT. Ch. 30. No. 2. Factorte. specifying the number of persons who may, under the provisions of this section, be emploved in that room. 7. Adequate ventilation by the circulation of fresh air shall be maintained in each workroom and all fumes, dust and other impurities that may be injurious to health generated in the course of any process or work carried on in the factory, shall be, so far as practicable, rendered harmless and removed by mechanical means if necessary 8. (1) Sufficient and suitable lighting, whether natural or artificial, shall be provided and maintained in every part of a factory in which persons are working or through which they may pass. (2) All glazed windows and skylights used for the lighting of workrooms shall, so far as practicable, be kept clean on both the inner and outer surfaces and free from obstruction: Provided that this subsection shall not affect the white-washing or shading of windows and skylights for the purpose of mitigating heat or glare. 9. Where anv process is carried on which renders the floor liable to be wet to such an extent that the wet is capable of being removed by drainage, effective means shall be provided and maintained for draining off the wet. 10. Sufficient and suitable sanitary conveniences for the persons employed in a factory shall be provided, maintained and kept clean, and adequate lighting for the convenience shall be provided and maintained and, where persons of both sexes are or are intended to be employed, such conveniences shall afford proper separate accommoda- tion for persons of each sex. 11. (1) The foregoing provisions of this Part of this Ordinance relating to sanitary conveniences and any regulations or orders made in pursuance thereof shall be enforced by the local health authority. (2) The foregoing provisions of this Part of this Ordinance relating to cleanliness, overcrowding, ventilation