In sawmill operations, combustible dust can accumulate on equipment, rafters, floors, and production surfaces. If the dust becomes airborne, it can create a serious fire or explosion hazard. Good housekeeping is essential, but some cleaning methods can unintentionally increase risk. One of the most common examples is using compressed air to blow down and clear dust.

There are many challenges and risks with using compressed air for blowdown. It doesn’t actually remove dust; instead, it instantly generates a dense dust cloud creating a significant explosion risk. The dust gets redistributed, shifting from one place to another, spreading across machinery, product lines, and other sensitive areas. It can be forced into hidden spaces or up into rafters, making future cleanup more difficult. When hazards like static discharge or sparks combine with airborne dust, conditions for an explosion can develop quickly.

There are preferred cleanup methods that capture dust instead of dispersing it. Whenever possible:

• Vacuum using equipment rated for your site’s dust‑hazard classification.
• Brush and/or sweep which may be suitable for many areas when done carefully.
• Maintain routine housekeeping to help keep buildup below your site’s threshold limits to prevent hazardous accumulations.

Some worksites permit compressed-air blowdown. If it is allowed at your site, treat it as a controlled, high-risk activity with strict safeguards:

• Pressure limit — Keep discharge pressure at or below 30 psi (207 kPa).
• Rated equipment — Tools and equipment must be rated appropriately for dust based on the area’s hazard classification.
• Ignition control — Shut down, remove, and verify all ignition sources, including hot surfaces; check for elevated temperatures in the area.
• No hot work — Never perform hot work in or near the blowdown zone.
• Post‑clean removal — Ensure dust is removed to safe levels before restarting operations.
• Fire protection — Confirm fire‑suppression systems are active before, during, and after the task.

Combustible dust hazards are manageable when dust is prevented from becoming airborne and ignition sources are tightly controlled. Report dust accumulation early so it can be cleaned up before it becomes dangerous, and always prioritize cleanup methods that remove dust, not move it around.

Updated Combustible Dust Regulations are Coming

The Manufacturing Advisory Group (MAG) is continuing to track combustible dust risks and the upcoming WorkSafeBC regulatory requirements coming into effect on January 24, 2027. To help industry prepare, MAG has developed a new combustible dust regulation workshop designed to clarify what’s changing and what employers should be prepared for.

The workshop provides a high‑level overview of combustible‑dust hazards, an in-depth review of the new regulations, and an explanation of the expanded responsibilities for qualified‑person consultation. Participants will examine key changes, including Joint Occupational Health and Safety Committees (JOHSC) expectations relating to combustion risks, updates to combustible‑dust management processes, and new training requirements.

If you would like an in-person workshop at your site, contact Bill Laturnus, Senior Safety Advisor for Manufacturing, blaturnus@bcforestsafe.org.