Enclosed bays are useful for isolating thermal cutting, but they only work when airflow, filtration, and pressure are managed together. The goal is simple: keep fume inside, move air from clean to dirty, and filter before discharge or recirculation.

Set the airflow pattern

Introduce make-up air behind the operator or at high level on the clean side. Exhaust at or near the fume source—table downdraft, side draft, or elevated canopy that does not disrupt the process. Keep the path short and smooth to preserve performance under load.

Maintain slight negative pressure

Run the bay slightly under surrounding pressure so any leaks pull air in, not out. Use simple visual indicators or a low-range manometer to confirm pressure. Seal cable penetrations, door frames, and floor joints to avoid bypass that erodes capture.

Filter to the hazard

Thermal cutting produces ultrafines; apply high-efficiency (H13/H14) filtration on recirculating systems. Plan prefilter changes to prevent rapid loading that drops airflow. Where heat and load vary, choose equipment that can run continuously without starving capture points.

Operate, verify, and adjust

Log start-up checks: doors closed, seals intact, capture dampers open at the active station. Trend PM1/PM2.5 with a portable meter at the operator and at the bay boundary. If boundary readings rise, adjust make-up air direction, close unused capture zones, and check for leaks.

Practical takeaways

• Push clean air in; pull contaminated air out near the source.
• Hold a slight negative pressure to stop fume escape.
• Use H14 filtration and maintain prefilters to sustain flow.
• Seal leaks and close unused capture zones.
• Verify with PM readings and adjust until stable.

When the bay load spikes or layouts change, MAXVAC Dustblockers can support background air filtration, while a WFE can serve stations where a close hood is practical. Treat them as part of a single airflow plan, not as stand-ins for enclosure maintenance.