Combustible dust accumulations at height are a serious and often overlooked risk in industrial and commercial facilities. This centre explains the risk, the regulatory landscape, and how High Level Dusting's services fit into a facility's broader combustible dust management program.
Combustible dust is any finely divided solid material that presents a flash-fire or explosion hazard when suspended in air, under certain conditions, in any concentration or particle size. Many materials not normally considered flammable can burn rapidly when in a finely divided form — including some metals, plastics, wood, and organic materials such as flour, sugar, and grain.
At height — on rafters, beams, ductwork, light fixtures, and structural framing — combustible dust can accumulate undisturbed for long periods, out of sight and out of routine housekeeping. That accumulation is exactly the kind of surface high-level dusting is designed to reach.
Facility hazard classification, dust characterization, and compliance determinations belong to qualified facility and safety professionals. High Level Dusting provides high-level cleaning services as part of a facility's housekeeping program — cleaning alone does not make a facility compliant with applicable regulations or standards.
A dust explosion requires five elements together: a combustible dust (fuel), an oxidizer (typically oxygen in air), an ignition source, dispersion of the dust into a cloud, and confinement of that cloud. Removing any one element breaks the pentagon — which is why housekeeping that limits fuel accumulation is a foundational control measure.
Learn More About The PentagonRafters, beams and overhead framing sit above normal housekeeping reach, so dust builds up over months or years without being disturbed.
Accumulation at height is difficult to inspect from the ground, so its extent is often underestimated until an assessment is done.
Where the dust is combustible, accumulation at height positions a fuel source directly above equipment, personnel and ignition sources below.
Organic dust from flour, sugar, grain and other food processing materials.
Fine wood dust generated by cutting, sanding and processing operations.
Fine metal particulate from grinding, machining and finishing processes.
Fine particulate from plastics and rubber processing and finishing.
Combustible dust accumulation is a housekeeping problem before it's anything else. Consistent, documented cleaning at height is one of the most effective controls available to a facility.
Dry sweeping and compressed air can lift settled dust back into suspension, creating a temporary dust cloud. We remove dust with HEPA-filtered vacuum systems built for industrial dust collection.
Cleaning intervals are set by how fast dust accumulates in your facility, not a fixed calendar. High-production areas near dust-generating processes get scheduled more often.
Rafters, beams, ductwork, light fixtures, cable trays, and the tops of racking accumulate dust that floor-level cleaning never touches. That's the layer we specialize in.
Combustible dust can be ignited by a static discharge as small as a spark from an ungrounded surface. Our crews are trained to recognize static-generating conditions during high-level work and to avoid introducing new ignition sources while cleaning.
We do not certify or classify your facility's hazard zones. Static control measures on any job are matched to the classification and protocols your site's qualified person or engineer has already established.
You can't manage what you can't see. Every high-level job is documented — not just completed.
Our poles and access equipment carry camera-mounted heads, so accumulation levels and finished results at 40, 60, or 75 feet are documented on video and still images — not just described.
Each job produces a written summary covering areas cleaned, accumulation observed, and any conditions worth flagging to your safety team.
Photo and report history builds an audit trail over time, useful for internal safety reviews and for demonstrating a consistent housekeeping program.
We select vacuum systems, poles, and access equipment for the job in front of us, matched to your facility's requirements and hazard classification.
Including SkyVac high-reach vacuum systems, used to remove dust at height without dispersing it back into the air.
Extendable poles fitted with camera-mounted heads reach rafters, beams, and ductwork from the floor, keeping work grounded whenever the height allows it.
Boom lifts and scissor lifts, operated by licensed supervisors, for areas beyond the reach of ground-based tools — up to 75 feet.
We do not represent any vacuum, pole, camera, or accessory as ATEX, NFPA, Class/Division, or intrinsically safe rated unless that exact model and configuration has been verified for your site. Confirm equipment ratings against your facility's documented hazard classification before work begins.
Requirements depend on your materials, processes, and jurisdiction. We recommend confirming your obligations with a qualified engineer or your local authority having jurisdiction.
No. We provide high-level cleaning services. Classification and compliance sign-off should come from a qualified engineer or inspector.
Common examples include flour and grain, wood, certain metals, and plastics or rubber. Explore our material-specific pages for more detail.
We'll walk your facility, from the floor to 75 feet, and show you exactly where dust is accumulating out of sight.
Book A WalkthroughNot all combustible dust behaves the same way. The material determines how readily it ignites, how fast it propagates and how much accumulation is enough to matter. What does not change is where it settles: rafters, beams, ductwork, pipes, cable trays and light fixtures, out of sight and out of reach of normal housekeeping.
Flour, grain, sugar, starch and milk powder are among the most common combustible dusts in Ontario facilities, and bakeries, mills and food plants generate them continuously. The fines are light enough to travel on air currents and settle on overhead steel and duct exteriors long before anyone notices them from the floor. Food-grade environments also limit what you can use to clean, which is why HEPA-filtered extraction from the ground rather than blowing down with compressed air is the right method here.
Sawmills, joineries, cabinet shops and furniture plants produce sawdust and wood fines that accumulate fast on rafters, beams and extraction ductwork. Wood dust is a recognised combustible dust and the layers that build up on overhead structural steel are the ones most often missed, because floor-level housekeeping deals with what people can see. Removing that accumulation at height is the part that reduces the risk.
Aluminium, magnesium, titanium and steel fines from grinding, machining, polishing and finishing are among the most reactive combustible dusts there are, and some react with water, which rules out wet cleaning methods. Metal fines settle on overhead beams, conduit and light fixtures throughout fabrication and finishing shops. Cleaning them needs equipment and a method chosen for the specific material, established before anyone starts.
Polymer powders, resin fines and rubber crumb from moulding, compounding, grinding and extrusion settle on overhead surfaces across plastics and rubber plants. These dusts carry a static charge readily, which matters because static is a recognised ignition source, and they tend to cling to ductwork and cable trays rather than falling away. Regular overhead cleaning is the practical control.
Whatever the material, the approach is the same. We assess accumulation on overhead surfaces with camera-assisted inspection from the ground, choose an access method and equipment suited to the dust and the height, remove the accumulation with HEPA-filtered extraction rather than dispersing it, and document the result with before-and-after imagery for your records.
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