The cause of most oven explosions and equipment failures can be traced back to human error. Inadequate operator training and improper equipment application are the greatest contributors. Warning signs and instructions, in addition to training and maintenance, can serve as reminders to operators that the equipment they are comfortable with can be a hazard. Safety labeling has been part of NFPA 86 since 1950, yet some users have little or no knowledge of the safety standard. The 1999 edition of NFPA 86 Standard for Ovens and Furnaces includes some rewritten information on safety labeling.
Manufacturers continue to be responsible for signage on the equipment they make.
A warning label also must be affixed to the equipment stating that it should be operated and maintained according to instructions. Number of gallons of solvent and volatiles entering the oven. Required purge time. Oven operating temperature. Exhaust-blower rating for gallons of solvent per hour or batch at the maximum operating temperature.