Cheap. efficient. strategic fire alarm

A fire may be started by an unstubbed cigarette-end, a faulty electrical appliance carelessly left on, or lighted paper shoved through the letter-box by vandals. You may, like a great many people have furniture stuffed with deadly polyurethane foam, which catches a light easily, burns rapidly and produces vast quantities of dense and highly toxie smoke. In most cases, smoke is the killer. People asleep are poisoned and rendered helpless long before the heat gets to them to finish the job. And all this happens in a surprisingly short time: a few minutes at most.