No building or other structure or part thereof shall be maintained in use for any manufacturing process which produces combustible or explosive dust, or for the storage of any material involving explosive or combustible dust, for more than one (1) year after June 27, 1949, unless:
(a) All elevator legs, spouts, hoppers, and other conveyors are reasonably dust-tight and are so maintained;
(b) A suitable and approved dust removal system is provided, maintained and operated wherever dust may accumulate within the interior of a building, or a system of inert gas for fire and explosion prevention is installed in conformity with the applicable code listed in Section 385.30;
(c) No open flame or spark-producing equipment is provided or maintained within rooms where dust may accumulate;
(d) Separators for the removal of ferrous particles are provided and operated ahead of all grinding or pulverizing machines whenever ferrous particles may be present;
(e) All crushing, drying, pulverizing and conveying equipment and systems, and all other equipment which may accumulate static charges, are effectively grounded.
(Ord. No. 991-49. Passed 6-27-49, eff. 6-27-49)