A finished polished floor still produces dust. Burnishing abrades a thin film, dry mopping lifts it, and on a large floor that airborne load is enough to trigger complaints in hospitals, schools and food areas. Controlling it is a maintenance design problem, not a cleaning problem.

Where the dust comes from

Source	Particle size	Control
Burnishing pad wear	Sub-micron to 10 micron	Burnisher with dust port and HEPA vacuum
Dry mopping	10-100 micron	Microfibre, slow passes, pre-mist
Traffic brought in	Mixed	Entrance matting, 3-5 m walk-off
Joint filler wear	Fine	Flush joints, correct filler hardness

Burnish with extraction, not just a pad

Most burnishers can be fitted with a dust port and a HEPA vacuum. That single change removes the majority of airborne load in the occupied space. If the machine has no port, burnish out of hours and ventilate for 30 minutes.

Damp, not wet

For dust mopping use a pre-misted microfibre flat mop: enough moisture to hold particles, not enough to leave a film. A wet mop on a polished floor leaves mineral residue that dulls the surface within weeks, which is exactly the outcome the maintenance programme was trying to avoid.

Sequence that keeps both dust and gloss under control

1. Dry microfibre pass to lift loose soil.
2. Damp microfibre pass at 1:128 neutral cleaner where needed.
3. Burnish dry with extraction on the traffic areas only.
4. Spot-clean edges and corners by hand rather than burnishing them.

Air quality targets

In sensitive buildings, measure rather than guess: a particulate counter at breathing height during burnishing should stay under 100 micrograms per cubic metre for PM10. If it does not, the machine lacks extraction or the filter is overdue.

• Change HEPA filters on the manufacturer interval, not when they look full.
• Never burnish over grit; one pass grinds it into the surface and leaves a scratch trail.
• Keep entrance matting 3-5 m long; most floor dust is walked in, not generated on site.

Size the extractor to the machine, not to the room

Dust control on a finished floor is decided by the airflow at the tool, not by the size of the room. A burnisher with a standard vacuum port and a 30-litre bin will hold most of the film it abrades; the same machine with a clogged filter releases a visible plume at head height, which is what generates complaints in food and healthcare buildings.

Task	Extraction	Filter	Practical note
Burnishing a finished floor	On-board vacuum, 1200-1600 W	HEPA H13 preferred	Empty the bin at half full; a full bin drops suction sharply
Auto-scrubbing with soft pads	Squeegee vacuum, separate recovery tank	Standard plus fine bag	Clean the squeegee blade every shift
Spot polishing with a hand machine	Dust extractor, 2000 W minimum	HEPA H13	Use a 38 mm hose, not a 32 mm
Dry sweeping edges and corners	Do not sweep dry; use a treated mop	-	Dry sweeping is the largest single source of complaints
Grinding or re-cutting in an occupied building	Separate extractor with pre-separator	HEPA plus pre-filter	Shroud the tool and seal the work zone

The single most effective change on most sites is replacing dry sweeping with a treated or microfibre mop, and replacing a standard filter with HEPA on the burnisher that runs in public areas. Both cost less than a complaint and take minutes to specify.

What to measure and what to write down

Clients in hospitals, schools and food production increasingly ask for evidence, not assurance. Three records cover almost every request.

• Filter class and change date. Note the HEPA class on the machine and the interval you actually change it, not the interval in the manual.
• Extraction airflow check. A simple anemometer reading at the hose end before and after a filter change shows when suction has fallen off.
• Visible dust assessment. Walk the area 30 minutes after the task with a raking light and record whether surfaces at 1.5 m show settled dust.

Where air quality limits apply, the number that matters is the respirable fraction during the task, not the settled dust afterwards. If the specification names a limit, measure during the operation with a real-time monitor and keep the log; a clean floor after the fact does not demonstrate control during the work.

Finally, schedule matters more than equipment. Burnishing in an occupied food area at 7 am puts the dust into the shift; the same task at 6 am, with the extractor running and 30 minutes of settling before production, puts none of it into product. Write the window into the maintenance specification, not just the machine list.

Dust control is one of the few maintenance items a client can measure. Put the numbers in the maintenance spec and the complaint usually disappears.