I work in a shop which is 35 x 40 feet. I have built numerous cedar strip canoes etc. etc. I have started building hardwood strip hull & ribbed kayaks with treated canvas top, but I'm getting in trouble with WHMIS because of the dust. I have been doing this kind of work for over 25 years.

I believe in an open door policy which is an 8 x 10 garage door on each end of my shop. When I am ripping hardwood both doors are wide open to get rid of the dust. I have asked & asked but nobody can give me the parts per million before sawdust becomes explosive with the flow through ventilation that I have. Why is this not safe?

Parts per million (what would it look like?) I have no idea, I would like some information because I cannot afford a dust extraction system.

Thank you. Jake