Why it matters
In 2019 HSE strengthened its position on welding fume after evidence that mild steel welding fume can cause lung cancer. It no longer accepts general ventilation as enough on its own for indoor welding: suitable engineering controls, usually local exhaust ventilation (LEV), are expected, with RPE where extraction alone doesn't control the exposure.
What the law says
COSHH Regulation 9 requires LEV to get a thorough examination and test at least once every 14 months, and records of each examination to be kept for at least five years. HSE guidance HSG258 sets out what the examination should cover.
What a thorough examination and test covers
- A visual inspection of hoods, arms, ducting, fans and filters for damage and wear.
- Measurements of airflow, such as capture velocity at the hood and air velocity in the ducting, compared with what the system should achieve.
- A check that the system actually controls the fume where the welder works, not just that the fan runs.
- A report saying what passed, what failed and what needs doing.
Who can do it
HSG258 expects a competent person. BOHS P601 (Thorough Examination and Testing of Local Exhaust Ventilation Systems) is the recognised qualification for this work. Ask to see it.