It is wise to be cautious in any attempt at indoor pest control especially when using aerosol bug bombs (total-release foggers) to control insect infestations in your home and other buildings.
Aerosol propellants used in foggers typically are flammable. You could cause a fire or explosion by using an excessive number of foggers and placing these so large amounts of propellant have contact with an ignition source. Combustible sources can include a flame, pilot light, or a spark from an electrical appliance that cycles on and off such as a refrigerator or air conditioner.
The Environmental Protection Agency recommends that an active fogger placed at least six feet or further from all ignition sources.
To reduce the likelihood of an accident, do not use any more foggers than is necessary. One six ounce or eight ounce fogger generally is sufficient for an average size home; smaller sized foggers are available for apartments and other small units.