Local Exhaust Ventilation for the Control of Welding Fumes in the Construction Industry

A Literature Review of LEV Effectiveness for Welding Fume Control

LEVCentral Expert Commentary

Research papers do not often find their way into day-to-day discussions between LEV engineers, occupational hygienists and duty holders. However, some publications provide valuable evidence that helps support the decisions practitioners make when designing, commissioning and testing control systems.

This peer-reviewed paper by Flynn and Susi examines the effectiveness of Local Exhaust Ventilation (LEV) for controlling welding fume exposures within the construction industry. Unlike manufacturing environments where welding is often carried out at fixed workstations, construction welding frequently takes place in changing locations and awkward positions, making effective fume control significantly more challenging.

The authors reviewed published studies covering construction, shipbuilding and other industrial sectors to assess how well different LEV approaches controlled exposure to welding fume contaminants, including manganese and hexavalent chromium. Their findings provide encouraging evidence that properly designed and correctly used LEV systems can achieve substantial reductions in exposure levels and, in many cases, reduce exposures below relevant occupational exposure limits.

Particularly relevant for LEV professionals is the paper’s emphasis on practical factors that determine whether extraction systems succeed or fail. The review repeatedly highlights the importance of hood positioning, airflow performance and worker behaviour. The findings reinforce a message familiar to anyone involved in LEV commissioning: system performance depends not only on design specifications but also on how equipment is used in real-world conditions.

The paper also discusses extraction welding torches and demonstrates that effective fume capture can be achieved without compromising shielding gas performance when systems are correctly designed and operated. This remains an important consideration for industries seeking practical engineering controls that can be deployed in dynamic working environments.

Although published in 2012, many of the lessons remain highly relevant today, particularly given HSE’s current position that all welding fume should be adequately controlled regardless of the material being welded.

Source Document

View Original Article

Source: Annals of Occupational Hygiene (now Annals of Work Exposures and Health)
Document Type: Peer-Reviewed Research Paper
Status: Published 2012
Last reviewed by LEVCentral: June 2026

Key Learning Points

Welding fume exposures are often more difficult to control in construction than in fixed manufacturing environments.
LEV can significantly reduce exposure to welding fume contaminants including manganese and hexavalent chromium.
Studies reviewed by the authors demonstrated exposure reductions of 40–50% or more when effective LEV was used.
Correct hood positioning is critical to achieving effective contaminant capture.
Adequate extraction airflow must be maintained throughout the task.
Extraction welding torches can provide effective control when correctly applied.
Worker behaviour and work practices play a major role in determining overall control effectiveness.
Additional research is needed into barriers preventing wider adoption of LEV within construction activities.

Further Resources

HSE WL Series – COSHH Essentials for Welding, Cutting and Allied Tasks
HSE Welding Fume: Protect Your Workers Campaign
HSG258 – Controlling Airborne Contaminants at Work
INDG408 – Clearing the Air: A Simple Guide to Buying and Using LEV
BOHS Welding Fume Control Selector Tool

Recommended Learning

Thought Leadership

One of the most interesting findings from this review is that the success of welding fume control is often determined less by the type of LEV system installed and more by how effectively it is applied. The paper repeatedly demonstrates that even well-designed systems can perform poorly if hoods are incorrectly positioned or if work practices fail to support the control strategy.

For those involved in LEV commissioning, this reinforces a key principle that underpins defensible commissioning and performance verification. Measuring airflow alone does not demonstrate control. Effective control is achieved only when the system captures contaminants at source under real operating conditions.

The paper therefore provides valuable evidence supporting the continued use of visualisation techniques, operator engagement and task-based performance assessment alongside traditional engineering measurements.