A fire can occur if fuel is spilled. Also, flammable vapors of many types from many sources can occur within a home or building. Few people realize the vapors from tile cement can be very explosive. It is not inconceivable for someone to use a space heater where tile cement is being put down or lacquers are being applied. Other sources include cleaning agents, adhesives, and some aerosol products.
Any product using a solvent other than water is a potential source of fire or an explosion.
There are other fire hazards, such as curtains, paper, carpets or anything in the home that is combustible. Carbon monoxide poisoning deserves the most attention. Carbon monoxide is referred to as the silent killer. People overcome by carbon monoxide usually have no warning. Some may notice a slight tightness in the chest, but this may not be a major factor since the brain is being dulled by the absence of oxygen-rich blood and the warning is easily ignored or misunderstood.