13. Any system or device for safe exit may be adopted if it is approved by the inspector. If there are no means of safety apart from the ordinary exits, or if the safety system in use is not approved by the inspector, the latter may, by an order given to the owner, tenant, agent or superintendent of the building, require one or more safety devices. Such safety devices shall be installed at the places directed by the inspector, and built in the manner specified in the order. The exits or safety devices shall comply with the specifications contained in the order or with those contained in the following paragraphs:
(1) Safety staircases shall be built of iron, with sufficient side railings, and shall be connected with the inside of the building by means of doors or windows; and shall also have sufficient landings at each story above the first, including the attic when it is used as a workshop, and shall be kept in good condition and unobstructed.
(2) Canvas tubes shall consist of tubes made of strong canvas, treated chemically and so as to offer sufficient resistance to fire. Such tubes shall be solidly fixed to an iron frame, and shall be supplied with brakes to check the descent.
(3) Metal tubes shall consist of tubes of steel or of sheet iron, of spiral form, and connected to each story by galleries.
(4) All balconies, galleries and staircases shall be put up at the places and in the manner determined by the inspector. Canvas tubes shall be placed in portable chests, and installed in the places determined by the inspector.