jrn8265 wrote:I though an OVER draft (too strong) caused hopper fires not LOW (too weak) draft! Which is correct? Thanks
I think on coal it is an overdraft.
The scenario Steamup gave would work for pellets which will ignite at a lower temp. I am pretty sure with a coal stoker the only two ways you could get a hopper fire is too much draft, or an improperly sealed grate.
I am no expert either, just my opinion.