Spray operations can present both physical and health hazards to those involved. One of the most frequent types of spray operations is spray painting, and spray booths are a common engineering control used to protect workers. Spray booths serve two main purposes: (1) to protect the health of the painter, and (2) to reduce fire and explosion hazards. Your company might have an enclosed structure where your spray finishing is done. This is a spray booth — a power-ventilated structure provided to enclose or accommodate a spraying operation to confine and limit the escape of spray, vapor, and residue, and to safely conduct or direct spray, vapor, and residue to an exhaust system. If your workers perform spray finishing using flammable and combustible liquids, there are several hazards of which to be aware. Due to the flammable and combustible nature of most spray finishing materials, no smoking or sparking tools are allowed. These could cause fire and explosion. The accumulation of paint vapors, mists, powders, and residues must be properly controlled. Respiratory protection must be provided if necessary. If your company has fixed extinguishing systems that use agents such as carbon dioxide in concentrations known to be hazardous to employee safety and health, your company must post warning signs.