StacksVerified U.S. regulatory reference

46 CFR §119.470

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (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. (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. (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.
  2. (b)Vent openings may not be located adjacent to possible sources of vapor ignition.