Propane requires a large volume of air to burn properly. In fact, 23.5 cubic feet of air is needed to burn just one cubic foot of propane. With adequate ventilation, an operating burner gives off a number of harmless products such as carbon dioxide and water vapour however, a propane appliance starved of oxygen can quickly produce dangerous amounts of carbon monoxide. For safety's sake, use your propane appliance only for the purpose for which it was designed. Don't, for example, use a stove as a space heater.
Carbon monoxide is both colourless and odourless.
It can't be detected by sense of smell. If any of these symptoms should develop, get into the fresh air immediately. For recreational use propane is generally sold and stored in a cylinder. Assuming it is kept in good condition, the cylinder can be refilled indefinitely. When properly filled, a cylinder has about 75 per cent of its volume occupied with liquid propane.