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A thermal fogger is a device you can use to fight pest problems in outdoor areas. As the name suggests, a thermal fogger uses heat to vaporize a fogging solution. In most cases, this liquid is an insecticide. It sprays the solution out of the nozzle of the fogger in the form of a mist or a fog.
Thermal foggers have a storage tank that can hold anywhere from about 1.2 L to 10 L of solution. This container, which holds insecticide or other fogging liquids, is located on the bottom of most foggers. In some foggers, though, this container is within the body of the machine.
Cold Foggers or Ultra low Volume (ULV) foggers provide a cold fog with particle sizes in the 5-20 micron range. Cold foggers use air pressure to atomize the insecticide and are powered by gasoline, compressed air, or electricity. The lack of heat (and thus the fire risk) makes the ULV fogger safer for indoor use. Both thermal foggers and ULV or cold foggers may be used inside or outside and both can fog water or oil-based products. Sanitizers, disinfectants, mold, and fungi control products are most often applied by cold foggers which allow adjustment of the particle size and provide larger particles used for these applications.
Research data indicate ULV fog is best for indoor control of stored product insects (beetles, moths, etc.). The optimum particle size theory plays an important role in the use of ULV fogging equipment for insect control. Droplets of pesticide found to be most effective are those with a small size range allowing them to remain airborne for a considerable length of time and to be carried to the insect by atmospheric transport.
The usage of both thermal and ULV foggers is similar in many ways, as both devices are generally foggers or misters and are used to spray out either a water or oil based fogging solutions. Both types of foggers are used in such applications as insect control, odor and mold control in indoor areas, for disinfection, to apply pesticides to plants, getting rid of pests in warehouses and other similar uses. Besides these places, there are other areas, where thermal foggers are better suited than ULV foggers and other way. Thermal foggers have advantage of producing particles in smaller size than ULV foggers and the fog is also easily visible, which makes them better in such applications as:
Mosquito and insect control. Because of small droplets a thermal fogger produce, they are good for mosquito and other smaller insect control. For mosquito control the best droplet size is from 5-20 microns, and most thermal foggers will produce particles in this range. Controlled outdoor fogging. Because fog that a thermal fogger produce is thick and easily visible, you can more easily control the direction of fogging. This will make an outdoor fogging more controlled, because most ULV fogging devices produce hardly visible fog.