A clean air zone gives workers a respite area and protects sensitive tasks near dusty operations. With simple planning and the right controls, you can create a low-particulate space even in active build zones.

Plan the location and purpose

• Place upwind of dusty work and away from vehicle routes.
• Define use: breaks, battery charging, first aid, or clean assembly tasks.
• Size for occupancy and set access rules to prevent contamination.

Build the envelope

• Use rigid panels or intact sheeting to form a continuous barrier; tape all joints.
• Add a soft door or simple airlock to limit dust ingress during entry.
• Provide cleanable, smooth surfaces; avoid fabric that traps dust.

Move and clean the air

• Run an air scrubber or negative air machine with H13/H14 final filtration; H14 is appropriate for respirable dusts.
• Aim for multiple air changes per hour; start around 6 ACH and tune using PM readings.
• Position intake low and exhaust high (or to outside) to create a consistent flow path.

Operate and maintain

• Use pre-filters and change them before pressure rises sharply; keep a log.
• Do not sweep inside the zone; use M/H-class vacuums and sealed bagging.
• Set housekeeping times so the zone remains genuinely clean.

Validate performance

• Measure PM2.5/PM10 inside and just outside the zone; aim for a clear gradient.
• Record results and any changes in the site H&S file and COSHH documentation.

Practical takeaways

• Seal the envelope, control entry, and use H13/H14 filtration.
• Tune airflow using PM data, not free-air specs.
• Keep the zone clean with vacuums, not brooms.

Clean air zones need discipline more than complexity. With a sealed envelope, validated airflow, and simple housekeeping, they deliver real protection on busy sites.