30 CFR § 57.4531 Surface flammable or combustible liquid storage buildings or rooms.
(a) Surface storage buildings or storage rooms in which flammable or
combustible liquids, including grease, are stored and that are within 100
feet of any person's work station shall be ventilated with a sufficient
volume of air to prevent the accumulation of flammable vapors.
(b) In addition, the buildings or rooms shall be--
(1) Constructed to meet a fire resistance rating of at
least one hour; or
(2) Equipped with an automatic fire supression system;
(3) Equipped with an early warning fire detection device
that will alert any person who could be endangered by a fire, provided that
no person's work station is in the building.
(c) Flammable or combustible liquids in use for day-to-day
maintenance and operational activities are not considered in storage under