If gas continues to escape and feed the fire turn cylinder so that the flames do not effect other items. It is best in these circumstances to leave the flame burning as otherwise the gas could build up and violently burst into flames from another source. When in doubt contact the fire brigade. By following these simple rules, South African consumers use some 280 million kilograms of LPGas every year with an insignificant number of mishaps. If we just seal ourselves in a room we will be using up this oxygen with our normal breathing.
Ventilation is the free entry and circulation of air in a space such as a room.
A vent is an opening allowing air to pass through. Ventilation is required if the air in a room is being used up by people breathing, flames burning and so on. If ventilation is not provided then the existing oxygen in the air will be used up, the flames will start to smoke and eventually go out and the people will lapse into unconsciousness and eventually suffocate. It is not enough to assume that a flue, if fitted, will take out the stale air. A separate high level vent is essential - particularly if people are likely to be in the room.