Reducing boiler air in-leakage is a never-ending chore. Boiler leaks are hard to find and permanently fix. Stop one leak, and more will inevitably appear - usually in the same area. Learn how one utility reduced air infiltration at a coal-fired plant from 12.5 la to less than 2%, saving over a million dollars in fuel costs annually. Too bad the maintenance budget doesn't get a percentage of the,savings.