(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 VAPORS
KEEP LIGHTS AND FIRE AWAY
NO 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.