It shall be unlawful for the occupant of any building within the City to use, maintain, suffer, permit or allow the use of any defective stove or heating devise in any building, and if, in the opinion of the Officer any defective stove or heating device is used or maintained in any building, the occupant of such building, on the order of the Officer, shall forthwith remove or cause to be removed, or repair or cause to be repaired to the satisfaction of the Officer, any such defective stove or heating device, and any such occupant who fails, refuses or neglects to carry out any such order of the Officer within the time specified therein shall be guilty of an offense against this Bylaw. Gas and electric heaters or plates, if used or maintained over wood shelving or tables shail be protected with approved non-combustible material over an area one and one-half times the area of such gas and electric heatere or plates, and when the number of gas jets or electric heaters installed would tend to generate an excessive temperature the Officer may require such further protection as in his opinion may be necessary. Gas plates and heaters shall not be installed under any wood shelving which is less than four feet distant from such gas plates and heaters and shall be at least twelve inches in the clear of any combustible material at the sides and back. Provided, however, that when any woodwork ia protected at the back and sides of such gas plates or heater with a shield o f incombustible material extending at least eighteen inches in height from the base of such gas plate or heater, the distance afcresaid may be reduced by one-half. All installations using gas shall be vented in accordence with the provisions of the Building Bylaw and other bylawa of the city respecting gas installations. Repealed. Whenever in any building or premises there shall exist any inflammable, combustible, or explosive material or substance, or any dangerous or unnecessary accumulation of waste materials or litter of a nature especially liable fire, and which materials are so situated, in the opinion of the Officer, as to endanger life or property, or to obstruct ingress or egress from such building in case of fire, or which may be liable to interfere with the operations of the Fire Department, or where eny condition exists which is considered by the Officer to be a fire hazard, the occupant of auch building or preaises shall forthwith, in the order of the Officer, have such inflammable, combustible, or explosive material or substance, or any dangerous or unnecessary accumulation of waste materials or litter removed, disposed of, or otherwise dealt with as may be ordered or directed by the Officer, and any such oceupant who fails, refuses, or neglects to carry out any such order of the Officer within the time specified therein shall be guilty of an offense against this Bylaw. (a) It shall be unlawful for any person to obstruct any fire escape, passage-door, hall or window, or to obstruct any exit leading to any fire-escape in any building; and all fire-escapes and exits ia buildings shall at all times be kept and maintained free and in good order and repair satisfactory to the Officer. All paseages in buildings shall be maintained free Jrom-obetrusses 902 6 JUN - 5 1980