Overview

This case study highlights a common issue in UK workshops:
dust escaping from enclosed CNC machines despite extraction being installed.
LEV Tec Solutions carried out an Air Quality & LEV Performance Review to assess whether the system was effectively controlling exposure to wood dust.

The Problem: CNC Dust Extraction Not Controlling Exposure

The woodworking facility operated enclosed CNC routers connected to a central dust extraction system.

While the system appeared functional, the client reported:

• Dust settling on surrounding surfaces
• Visible airborne particles when opening CNC machine doors
• This raised concerns that the dust extraction system was not effectively containing fine dust at source.

On-Site Findings: Why Dust Was Escaping

During live operation, LEV Tec Solutions observed:

• Fine wood dust released immediately when enclosure doors were opened
• Airborne particles clearly visible under workshop lighting
• Dust accumulation outside the CNC machine enclosure
• Operators exposed during unloading processes

Root Causes Identified

Poor enclosure sealing allowing dust leakage

Insufficient airflow to maintain negative pressure within the enclosure

Loss of containment during operation and post-cycle access

The Risk: Exposure to Respirable Wood Dust

The escaping dust included fine respirable particles, which pose serious health risks, including:

• Occupational asthma
• Chronic respiratory issues
• Increased risk when working with hardwood dust
• Under COSHH, exposure must be adequately controlled and demonstrably effective not assumed.

The Solution: Improving CNC Dust Extraction Performance

LEV Tec Solutions provided clear, practical recommendations:

• Identify and seal enclosure leakage points
• Improve airflow performance and system balance
• Ensure effective containment within CNC machines
• Carry out a Thorough Examination & Test (TExT) to verify compliance

The Result: Improved Dust Control

After implementing recommendations:

• Dust escape was significantly reduced
• Improved containment within CNC enclosures
• Reduced visible airborne dust in the workshop

Key Takeaway

CNC dust extraction systems do not guarantee effective control. If airflow and enclosure integrity are not correct, fine wood dust will escape and exposure will occur.