(a) Smoking or the use of open flame is prohibited in any hold or compartment containing a Division 2.1 (flammable gas) material, near any Division 2.1 (flammable gas) material stowed on deck, or near any ventilator leading to a hold containing this material.
(b) A sign carrying the legend: FLAMMABLE VAPORSKEEP LIGHTS AND FIRE AWAYNO SMOKING must be conspicuously posted at each approach to an ``on deck'' Division 2.1 (flammable gas) material stowage area and near each cargo hold ventilator leading to a hold containing this material. The sign must be painted on a white background using red letters. The letters may not be less than 8 cm (3 inches) high.