Dust collection and extraction

Capturing dust at the tool is the most effective thing you can do about wood dust. HSE calls it the best way to control exposure, because dust that never reaches the room can’t be breathed by anyone.¹ In safety terms it is an engineering control, which ranks above respirators.²

Why sanding is the worst

• Sanding produces fine dust, while sawing, turning and routing mostly produce coarser dust.³
• Fine dust is the biggest health risk: it travels further from the tool and you can breathe it deep into your lungs.¹
• Machine and hand-held power sanding are among the jobs HSE lists for high dust exposures, alongside sawing, routing and turning, emptying collector bags, and dry sweeping.¹
• Fine sanding dust is also the most explosive kind.⁴

So if you only improve one thing, put extraction on your sanders. NIOSH tested an extra-suction design on a random orbital sander that cut dust emissions by about 90%.⁵

How capture works

• Fast-spinning blades and cutters act like fans and throw dusty air outward. Good extraction contains that air flow, not just the visible chips.¹
• The hood (the guard, shroud or port that collects the dust) is the part that most often fails. Poor hood design and too little airflow are the two main reasons extraction doesn’t work.¹
• Get the hood as close to the source as possible and enclose it as much as you can. A hood that has to reach out to pull dust in only works within about two hood diameters of its opening.¹
• Many machines need more than one pickup, for example above and below a blade.¹
• Ask the machine maker how much airflow its dust port needs.¹

Ducts, gates and hoses

• Keep ducts short and smooth, with gentle bends and few junctions. Sharp bends waste airflow.¹
• Keep flexible hose short; it adds resistance and clogs easily. Earth (ground) flexible hose with a metal helix to prevent static buildup.¹
• With one collector serving several machines, open only the gates you need. Too many open gates starve each hood of air; too few can let dust settle in the ducts.¹
• An airflow indicator on each hood shows at a glance whether the system is actually pulling.¹

Collectors and vacuums

The two common options do different jobs:

• Dust collectors move a large volume of air through wide ducts. They suit machines that make chips and shavings as well as dust, such as saws, jointers and planers. Extraction for these machines has to carry the heavy chips away as well as capture the fine dust.¹
• Vacuum-type extractors (including shop vacuums) pull hard through a small hose. They suit hand-held power tools such as sanders, where the dust is drawn through holes in the pad.⁵
• A cyclone or settling stage in front of the filter takes out most of the chips and extends filter life.¹
• For vacuums used to clean up fine dust, HSE recommends at least dust class M.⁶ See Cleanup.

Filters

• The filter decides how much fine dust goes back into the room. Check what it is rated to capture, keep it in good condition, and clean or replace it as the maker says.¹
• Emptying bags and bins is itself a high-dust job. Wear your respirator when you do it.¹
• Where possible, put collectors and their filters outside the workroom. This also keeps the ducts indoors under suction so leaks pull air in rather than blowing dust out.¹

Ambient air cleaners

Ceiling-hung or box-fan air cleaners filter room air. They can reduce dust that escapes capture, but they only act on dust that is already in the air you are breathing. Treat them as an extra layer after capture at the tool, never instead of it.¹²

Check that it works

You can’t judge extraction by looking at the floor. Fine airborne dust is normally invisible.¹

• Dust lamp test. Darken the shop, shine a bright beam through the air near the tool while it runs, and look back along the beam at a slight angle. Fine dust shows up as a glittering cloud. Shield your eyes from the beam.¹
• Smoke test. A smoke generator shows whether a hood captures the air movement around the tool. Run it with the machine on, and keep in mind it may set off smoke alarms.¹
• Maintenance. Look for damaged hoses, blocked ducts and dirty filters on a regular schedule.¹ In UK workplaces, extraction systems must be thoroughly examined by a competent person at least every 14 months.⁶ For deeper design guidance, see HSE’s guide to local exhaust ventilation.⁷

Quick checklist

• Extraction on every dust-making tool, especially sanders.
• Hoods close to the cut, gates set for the tool in use.
• Collector filter rated for fine dust and in good condition.
• Respirator on when emptying bins or bags.
• Occasional dust lamp check.
• Respirator still worn for sawing, routing and sanding (why).¹

Last reviewed 2026-11-07.