4-4-4: USE OF APPROVED APPLIANCES:
All domestic and commercial liquefied petroleum gas consuming appliances shall have their correctness as to design, construction and performance certified to by one of the following agencies:
   A.   Testing and listing as approved for use of liquefied petroleum gas by the AGA Testing Laboratory and should bear the AGA seal of approval for liquefied petroleum gases.
   B.   Approved through tests by any other competent laboratory recognized by the endorsing authority.
   C.   Approval by the State Fire Marshal. (1975 Code § 4-4-4)