All factory buildings shall be well lighted and ventilated. Ground floors of all buildings shall be of concrete. Walls, ceilings, or other overhead coverings or parts thereof not finished in tile or other glazed material, shall be kept painted with a white paint so that they may be easily cleaned and shall be cleaned whenever they become soiled or dirty. Windows, window ledges, and other places where dirt and dust may accumulate shall be cleaned whenever they become soiled or dirty.
September 23, 2013