The Importance of Changing Filters in Local Exhaust Ventilation (LEV) Systems

The Importance of Changing Filters in LEV Systems

Local Exhaust Ventilation (LEV) systems play a vital role in protecting workers' health by capturing and removing airborne contaminants such as dust, fumes, vapours, and oil mist before they can be inhaled. However, to maintain this protection, regular filter replacement is essential. Over time, filters become clogged with captured particles, reducing airflow efficiency and compromising system performance — which can lead to serious health, safety, and compliance issues.

Why Filter Maintenance Matters

Filters are the heart of any LEV system. They ensure that harmful contaminants are trapped and prevented from re-entering the workplace atmosphere. When filters become blocked or overloaded:

• Airflow efficiency drops – Reduced suction means contaminants are not effectively captured at the source.

  
  

• Energy consumption increases – The system has to work harder to maintain performance, resulting in higher operating costs.

  
  

• System wear and tear accelerates – motors, fans, and ductwork may experience additional strain, shortening the equipment's lifespan.

  
  

• Health risks rise – Poor extraction allows hazardous substances to remain airborne, exposing employees to potential respiratory and skin conditions.

  
  

• COSHH compliance may be compromised – A poorly maintained system can fail inspections and breach legal obligations under the Control of Substances Hazardous to Health (COSHH) Regulations 2002.

How Often Should Filters Be Changed?

Filter replacement frequency depends on several factors — including the type of process, contaminant levels, and usage intensity. For instance, systems handling fine dust or welding fumes may require more frequent changes than those capturing larger particulates.

To ensure filters are changed at the proper intervals, regular LEV testing and inspections are crucial. A working system can still have poor airflow or clogged filters, which can reduce its effectiveness.

How A-Mac Environmental Can Help

At A-Mac Environmental, we understand that every LEV system is unique. Our team of qualified engineers (P601 and P602 certified) can:

• Supply and replace any filter – from standard dust and particulate filters to specialised HEPA and carbon filters for complex extraction systems.

  
  

• Carry out LEV COSHH Testing – in line with HSG258 and COSHH Regulations, to ensure your system operates effectively and remains fully compliant.

  
  

• Provide detailed maintenance recommendations—based on test results —helping you plan filter changes, service schedules, and any necessary system adjustments.

  
  

• Offer comprehensive aftercare support – including maintenance contracts, performance monitoring, and spare parts supply.

  
  

Stay Compliant and Protect Your Workforce

Neglecting filter maintenance not only reduces system efficiency but also risks employee health and legal non-compliance. Regular filter checks, replacements, and LEV testing ensure your workplace remains safe, efficient, and compliant.

If you're unsure about the condition of your LEV system or when your filters were last replaced, contact A-Mac Environmental today. We can test your LEV system, assess filter performance, and supply the exact filters you need — ensuring your system continues to protect your people and your business.