Gas camping lanterns, Primus stoves, ski wax burners, aerosol cans and other small gas containers should only be stored outdoors. This reduces the chance of fire and explosion.
Small, pressurised containers contain flammable gases such as propane, butane, etc. If there is a leak, the gas will seep out and could turn the air into an explosion hazard.
The consequences can be enormous if gas leaks out and catches fire in a closed room. This is why you should use small gas containers outside in the open air.
Gas containers, whether large or small, should never be stored in the cellar or below ground level. Gas is heavier than air. If gas leaks out below ground level or in a place that has inadequate ventilation, it will accumulate on the floor. All it takes then is a small spark to ignite the gas and cause an explosion.
If you don't have a suitable cabinet or room to store these containers indoors, an external storeroom, cabinet or garage may be a safer place. You should not store more gas than you absolutely need.
Aerosol cans that contain gas as a propellant, and those that contain flammable chemicals should be stored in the same way as other gas containers. Aerosol cans are a fire hazard and should not be used near naked flames, sparks, hot surfaces, etc.