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; or
(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.