Most people believe the terms flea bomb and flea fogger mean two different things. In fact, they mean the same thing. They are terms used to refer to any insecticide that is automatically released consistently from an aerosolized container. These are designed to be specifically used against flea infestations. One of the reasons the products are called foggers is their ability to release a toxic fog or mist into the air. Some ingredients in flea bombs do not evaporate quickly. Instead, they use the base of your upholstery and carpentry to offer residual control over a period of time. This prevents infestation while the fogger is active. Some of these products release the formula in one go. This quickly creates a lethal environment for the targeted pests. Others release their mists slowly over a period of minutes or hours. The size of the can and the dispersal rate determines the duration the formula will be released.