When power ventilation is required, the ventilation may be accomplished by a ventilation system that serves other spaces.

When power ventilation is required, blower blades must be non-sparking and the system must be interlocked with the battery charger to prevent simultaneous operation.

When power ventilation is required, blower blades must be non-sparking and the system must be interlocked with the battery charger to prevent charger operation unless the ventilation fan is running.

Power and lighting batteries must be of the lead-acid type only.