"Tim Douglass" wrote in message
...

Well, this has absolutely nothing to do with the flammability of dust
in suspension in the air. This is about sanding an oil-finished floor
that has not fully cured and the heating that comes from the curing
process - or - about slightly wet sawdust being packed into a closed
container - or - about a spark from some other source getting included
in the sweeping up - I've seen sparks from tools and cigarettes both
end up starting fires that way (good thing to watch out for on your
dust collector as well. A cig sucked into the collection bag can ruin
your whole day).

Yeah