Posted by Harold Kestenholz - hydronic.net on January 04, 2002 at 09:27:17:
In Reply to: Mills Coal Fired Boiler posted by Ulysses Terry Savage on January 03, 2002 at 20:58:41:
If the chinney is completely clean and open, without cracks to let air in and kill the draft, something has changed, like an increased firing rate, or fuel moisture or quality, or air inlet quantity to exceed the draft capability.