WAC 296-835-12060. Make sure a heating system used for drying objects does not cause a fire

You must make sure the heating system used in a drying operation that could cause ignition: (1) Has adequate mechanical ventilation that operates before and during the drying operation; (2) Shuts down automatically if a ventilating fan fails to maintain adequate ventilation; (3) Is installed as required by NFPA 86-1999, Standard for Ovens and Furnaces. Note: Some, or all, of the consensus standards (such as ANSI and NFPA) may have been revised. If you comply with a later version of a consensus standard, you will be considered to have complied with any previous version of the same consensus standard.