Hello Judith, sorry for the delay in my response.
I feel that your woodworking shop must comply with OFC Section 5.10 Combustible Dust Producing Processes. if a Engineer would like to submit an alternative solution under Clause 1.2.2.1.(1).(b) good luck them them.
interesting read: http://www2.worksafebc.com/Portals/WoodProducts/Prevention-Sawmills.asp?ReportID=37458
Scott Hardwick