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§119.470 Ventilation of spaces containing diesel fuel tanks.
(a) Unless provided with ventilation that complies with §119.465 of this part, a space containing a diesel fuel tank and no machinery must meet one of the following requirements:
(1) A space of 14 cubic meters (500 cubic feet) or more in volume must have a gooseneck vent of not less than 65 millimeters (2.5 inches) in diameter; or
(2) A space of less than 14 cubic meters (500 cubic feet) in volume must have a gooseneck vent of not less than 40 millimeters (1.5 inches) in diameter.
(b) Vent openings may not be located adjacent to possible sources of vapor ignition.