The use of outdoor grills and fireplaces to prepare food is permitted unless prohibited by the Fire Department. The open burning of highly explosive or other dangerous materials for which there is no other known method of disposal or under other unusual circumstances is permitted if, on written request, the burning is:approved by the Commissioner and the Chief of the Fire Department; and done under the supervision of the Fire Department. The open burning of solid, liquid, or gaseous fuels, materials, or buildings is permitted if done for training purposes under the direct control and supervision of Fire Department instructors. Unless prohibited by the Fire Department, the use of salamanders or similar devices by construction or other workers for heat is permitted if:no smoke violation or other nuisance is created; and the salamander or other device is of a type approved by the Chief of the Fire Department. In an emergency declared by the Commissioner, the open burning of household and normal business waste is permitted if it is done in compliance with the conditions and requirements that the Commissioner specifies for the emergency. City Code, 1976/83, art. 11, §20 Ord. 99-548