(A) Additional vent openings or safety valves adequate to relieve any excessive pressure due to external heat shall be provided, of a type which shall be self-closing when pressure is relieved.
(B) The total area of vents shall not be less than 24 square inches for tanks of 21,000 gallons capacity or less; and 21,000 gallons capacity.
(1980 Code, § 27.018) Penalty, see § 98.999