Filter Maintenance

Filtered LEV systems are designed to capture and remove hazardous airborne substances (dust, fumes, vapours, etc.) before they can be inhaled. Filters are a key part of this system. Over time, they become clogged or saturated, which can:

• Reduce airflow and extraction efficiency
• Allow harmful substances to be released back into the workplace
• Lead to system damage or failure
• Increase energy usage and operational costs

Filter Change Schedules – Requirements & Best Practice

1. Manufacturer’s Guidelines
   Always follow the manufacturer’s guidelines and recommendations. Filter change schedule recommendations can be found in the original operation and maintenance manual
2. Performance Monitoring
   Pressure drop gauges, airflow meters, or differential pressure gauges can often indicate when a filter is becoming clogged.
   Filters should be changed when the pressure drop exceeds recommended levels.
3. Risk Assessment
   High-risk environments (toxic dusts, asbestos, biological agents) may require more frequent changes or scheduled replacements, regardless of apparent condition.

4. Scheduled Maintenance
Typically, part of a Preventive Maintenance Plan.

Standard frequency for inspections or changes:

• Monthly/quarterly checks for pre-filters
• 6-monthly to annually for primary filters
• Frequency can be dependent on usage – please refer to your manufacturer’s user manual

Best Practices for Filter Maintenance

Keep a Maintenance Log: Record filter changes, inspections, and performance data (LOG BOOK)

Train Staff: Ensure those responsible for maintenance regularly inspect the filter condition.

Dispose of Filters Safely: Filters can contain hazardous waste—dispose of them properly in accordance with environmental and safety regulations.

If you are working in a specific industry (e.g., pharmaceuticals, woodworking, welding, etc.), we can offer more tailored schedules or procedures.