All direct-heat grain dryers shall be equipped with automatic controls that:
Will shut-off the fuel supply in case of power or flame failure or interruption of air movement through the exhaust fan; and,
Will stop the grain from being fed into the dryer if excessive temperature occurs in the exhaust of the drying section.
Direct-heat grain dryers installed after March 30, 1988 shall be:
Located outside the grain elevator; or
Located in an area inside the grain elevator which is separated from other areas of the facility by construction having at least a one hour fire-resistance rating.
Located in an area inside the grain elevator protected by a fire or explosion suppression system; or