Power-operated or manual dampers are provided on some but not all boilers for superheater, economizer, and boiler outlet-gas control. Damper blades, constructed of thin metal, are susceptible to oxidation and warpage due to overheating and should be inspected for such damage. Supporting brackets, driving rods, pins, and other devices should also be examined.
The dampers should be operated and checked for binding closure, and freedom from obstructions should be ensured. Damper position should be confirmed with both control board and exterior indication devices. Personnel, other than those working on damper operation, should not be permitted in the damper section while the dampers are in operation.