The following are hazardous heating equipment conditions:
(A) Fuel supply connection of material other than pipe or tubing of solid metal and not permanently fastened in place.
(B) Equipment or vents so close to a wall of combustible materials or so lacking in insulation that there is danger of combustion.
(C) Equipment burning liquid or solid fuel which are not connected to chimneys or flues, or which are connected to vents suitable for gas only.
(Ord. No. 11.66, § 304(10), 2-4-66)