re: Danger of sawdust combustion?

You really only need 3 things to have a fire or explosion, they are: 1) heat. 2) fuel. 3) oxygen. So even without the spark their is a potential for fire or worse. By running a dust collection system you collect the fuel out of the air and it gets cooled in the air moving fast. Any and all equipment in a woodworking environment should be grounded. Fire extinguishers and sprinklers systems are great things to have. The best tool to have to prevent a dangerous situation is common sence. It’s not that common either, but if you have a cloud of dust and open sparks or static sparks are in that room filled with dust it could be dangerous. Like when using a table saw, always try to think of the worst “what If”.