Site offices and break rooms inside plants quickly collect dust unless they are treated as protected spaces. The aim is to keep airborne particulate out and pressure inside slightly positive.

Positive pressure and filtration

• Supply more clean air than is exhausted to maintain slight positive pressure so air leaks outward, not inward.
• Use high-efficiency filtration for supply units; for fine or carcinogenic dusts, H14 is the appropriate class.
• Position supply diffusers away from doors to avoid blowing dust inward when opened.

Seal the envelope

• Close gaps at door frames, cable penetrations, and suspended ceilings.
• Fit self-closing doors and consider a small lobby or airlock for high-traffic rooms.
• Use cleanable surfaces and avoid open storage that traps dust.

Housekeeping at the boundary

• Place tack mats and a vacuum point at the entrance; avoid dry sweeping.
• Set a footwear and PPE policy for entry. Provide bins for contaminated disposables outside.
• Monitor PM2.5/PM10 during peak operations; adjust supply, seals, or entry practices if levels drift up.

Office air purifiers can help maintain positive-pressure clean air when correctly sized and serviced, provided the room envelope and entry practices are well controlled.

Practical takeaways

• Maintain slight positive pressure with high-efficiency supply filtration.
• Seal penetrations and manage doors; consider an entry lobby.
• Stop dust at the threshold with mats and vacuuming, not sweeping.
• Track PM levels and adjust controls before complaints start.

A protected office gives teams a reliable refuge and a clean admin base, even when production areas are dusty, provided pressure, filtration, and boundaries are actively managed.