HEPA performance relies on seals, correct components and routine checks. Poorly maintained vacuums pass fine dust and give a false sense of control.

Know your system

Confirm filter classes and the order they sit in the machine. H13/H14 HEPA stages must be protected by intact prefilters and bags. For fine or carcinogenic respirable dusts, H14 is required. Keep only approved parts to prevent leakage.

Daily/shift checks

• Inspect hose, cuffs and gaskets; repair splits immediately.
• Ensure bags are seated correctly and not overfilled; change before backpressure climbs.
• Check under-load airflow. If drop is sudden, look for blockages; if gradual, plan a prefilter change.
• Visually confirm HEPA frame clamps and seals are evenly seated.

Weekly/monthly tasks

• Clean or replace prefilters as per duty; never knock HEPA elements—use the manufacturer’s method.
• Wipe the HEPA housing clean before reseating to protect the gasket line.
• Record filter changes and faults; trend data helps predict service intervals.

When filtration is compromised

If the unit is damaged, emits odour or visible dust, or fails to hold negative pressure, stop use. Do not run without the HEPA stage “just to finish a job”. Seal and label the machine if contaminated internally and arrange service.

Practical takeaways

• Protect HEPA with good prefilters and timely bag changes.
• Verify airflow under load; rising resistance demands action.
• Never tap or blow HEPA media; keep gasket faces clean.
• Use H14 where respirable carcinogenic dusts are present.
• Log maintenance to set realistic service intervals.

Regular, simple checks keep filtration effective and maintain trust in your dust control measures.