Wood Dust Extraction Requirements: What UK Workshops Must Get Right

Wood dust kills. That's not an exaggeration. The International Agency for Research on Cancer classifies wood dust as a Group 1 carcinogen — the same category as asbestos and tobacco smoke. In the UK, wood dust exposure causes nasal cancer, asthma, and chronic obstructive pulmonary disease. HSE estimates that thousands of woodworkers are overexposed every year.

If you run a woodworking shop, effective dust extraction isn't optional. It's a legal requirement under the Control of Substances Hazardous to Health Regulations 2002 (COSHH), and the HSE actively enforces it.

Why Wood Dust Gets Special Attention

Wood dust has specific workplace exposure limits (WELs) set under EH40:

Hardwood dust: 3 mg/m³ (8-hour time-weighted average)
Softwood dust: 5 mg/m³ (8-hour time-weighted average)

These limits apply at the worker's breathing zone, not at some distant sampling point. And they're maximums, not targets. COSHH requires employers to reduce exposure as far as is reasonably practicable — which in most woodworking operations means providing local exhaust ventilation at every dust-generating machine.

Hardwood dust is the bigger concern. Oak, beech, ash, mahogany, teak — all classified as Group 1 carcinogens. But softwood dust isn't harmless either. It causes occupational asthma and respiratory sensitisation. Both types require effective LEV control.

Mixed dust operations — which is most real-world workshops — must meet the lower hardwood limit of 3 mg/m³.

LEV Requirements for Woodworking

Under COSHH, every machine that generates wood dust needs extraction at source. That means the saw, the planer, the router, the sander, the lathe, the mortiser — all of them. Not just the biggest dust producers.

The HSG258 guidance sets out what effective LEV looks like for woodworking:

Capture at source. The extraction point must be as close to the dust generation point as possible. A hood mounted two metres above a table saw achieves almost nothing. The extraction needs to be integrated into the machine's guard or positioned within one hood diameter of the source.

Adequate capture velocity. The system must generate enough airflow to capture dust before it escapes into the workshop air. HSG258 recommends a minimum capture velocity of 1 m/s at the point of dust generation for most woodworking operations, though higher velocities are needed for high-energy processes like sanding.

Sufficient transport velocity. Once captured, dust must be carried through the ductwork to the filter or collector without settling. For wood dust, the minimum transport velocity in ducts is typically 20 m/s. Below this, dust accumulates in the ducting, reduces airflow, and creates a fire hazard.

Effective filtration. The air cleaning device — whether a bag filter, cartridge filter, or cyclone with secondary filter — must capture fine dust particles before air is discharged. If the system recirculates air back into the workshop, filtration standards are higher and the return air must be monitored.

Types of Wood Dust Extraction Systems

Fixed ducted systems

The standard for established workshops. A central fan and filter unit connected by ductwork to extraction points at each machine. Blast gates at each branch allow you to direct suction to the machines in use.

Fixed systems are the most effective option for workshops with multiple machines. They can be designed to handle simultaneous extraction from several points, and the central filter unit can be located outside or in a plant room.

Mobile or portable extractors

Single-machine units on wheels, typically with a bag or cartridge filter. Useful for small workshops with one or two machines, or for machines that move around. Their extraction capacity is limited — they work for a single machine at a time and typically can't match the capture performance of a properly designed fixed system.

On-tool extraction

Some power tools — handheld routers, orbital sanders, biscuit joiners — have built-in extraction ports. Connecting these to a suitable vacuum or extractor captures dust at the point of generation. On-tool extraction is a supplement, not a replacement for workshop LEV. It handles fine dust from portable tool operations but won't control the volume of dust a table saw or planer generates.

What HSE Expects to See

The HSE's woodworking guidance makes clear that dust control is an enforcement priority. The HSE carried out 4,000 targeted dust inspections in 2024/25 across multiple sectors, with woodworking prominent among them.

When an inspector visits a woodworking shop, they'll look for:

LEV at every dust-generating machine. No exceptions. If a machine makes dust and doesn't have extraction, that's a finding.
Evidence the LEV actually works. Visible dust on surfaces, dust deposits around hoods, or dust escaping past extraction points all indicate the system isn't performing.
A current TExT report. Under COSHH Regulation 9, your LEV must be thoroughly examined and tested at least every 14 months. No report means no evidence of compliance.
Maintenance and user check records. The HSE expects to see evidence of routine checks between formal examinations. A logbook or digital record showing daily or weekly checks demonstrates active management.
Worker training. Employees must understand why extraction is needed, how to use it properly, and how to spot signs of failure.

Common Failures HSE Finds in Woodworking Workshops

These come up repeatedly in HSE enforcement actions and inspection reports:

Machines without any extraction. Often smaller machines — a pillar drill, a bench-mounted bobbin sander, a scroll saw. If it generates dust, it needs extraction.

Extraction hoods positioned too far from the source. A hood that's been knocked aside, or one that was never close enough in the first place. The closer the hood is to the dust source, the more effective the capture.

Blocked or leaking ductwork. Dust builds up in ducts over time, especially at bends and junctions. Leaking joints mean dust escapes into the workshop instead of reaching the filter. Both problems reduce capture performance across the whole system.

Overloaded or damaged filters. A full collection bag or a torn filter means dust passes straight through the system or airflow drops below effective levels. Filters need regular inspection and replacement.

Recirculating air without adequate filtration. Some systems return filtered air to the workshop. If the filtration isn't good enough — or the filter is damaged — this pushes fine respirable dust back into the breathing zone. HSE scrutinises recirculating systems closely.

No TExT records. The most common finding of all. The system might work perfectly, but without a current examination report, you can't prove it.

Practical Compliance Checklist for Woodworkers

Use this to assess where you stand:

You can generate a more detailed checklist tailored to your setup using our LEV compliance checklist generator.

Keeping Your Records Straight

For a small woodworking shop, the paperwork side of LEV compliance can feel disproportionate. TExT reports, user check logs, maintenance records, training records — all need to be kept, organised, and producible on demand. LEVproof is being built to handle exactly this for UK workshops. Join the waitlist to get early access.

Sources

Control of Substances Hazardous to Health Regulations 2002 (COSHH) — legislation.gov.uk
HSG258: Controlling airborne contaminants at work — HSE
HSE woodworking guidance — HSE
LEV guidance for employers — HSE
COSHH main page — HSE
Work-related lung disease — HSE

This guide summarises published HSE and government guidance. It does not constitute legal advice. Consult a qualified professional for advice specific to your situation.