Certain equipment is often installed in workplaces to control heat sources or to detect fuel leaks. An example is a temperature limit switch on high temperature dip tanks, or flame failure and flashback arrester devices on furnaces, and similar heat producing equipment. If these devices are not properly maintained or if they become inoperative, a definite fire hazard exists.

Again, employees and supervisors should be aware of the specific type of control devices on equipment involved with combustible materials in the workplace and should make sure, through periodic inspection or testing, that these controls are operable. Manufacturers’ recommendations should be followed to assure proper maintenance procedures.