Phoenix Journal · LEV & Air Quality
Buying a fume extractor feels like solving the problem. It is not. Since 2019 the rules, and the science, have moved on, and controlling welding fume now means proving the extraction works and building a system around it.
For years, mild steel welding was treated as the low-risk end of the trade: a bit of smoke, nothing a big roller door could not handle. That view is now obsolete. In 2017 the International Agency for Research on Cancer reclassified welding fume as a Group 1 human carcinogen, a cause of lung cancer, and the evidence drew heavily on ordinary mild steel work. The regulator responded fast, and the practical consequence is that buying an extractor is no longer where the job ends. It is barely where it begins.
In February 2019 the Health and Safety Executive issued a safety alert strengthening its enforcement expectation for all welding fume, including mild steel, with immediate effect. The core message was blunt: general ventilation does not achieve the necessary control, so suitable engineering controls, typically local exhaust ventilation, are required for all welding carried out indoors, regardless of how long the job takes. Where LEV alone does not adequately control exposure, it must be supplemented with adequate and suitable respiratory protective equipment, and RPE is expected for welding outdoors too. Crucially, the HSE stated there is no known safe level of exposure, so the old argument that a quick weld does not count no longer holds.
Why extraction alone is not control
The trap is treating the purchase as the solution. A fume extractor bought, wheeled into the workshop and switched on does not control anything unless it captures the fume at the point it is generated, before it reaches the welder's breathing zone. That depends on the hood being the right type, positioned close to the arc, and repositioned as the work moves, on the airflow being sufficient, and on the welder actually using it as intended. On-tool extraction, which draws fume away at the torch, and well-designed capture hoods work; a general unit blowing across the shop does not. The difference between an extractor and a control is whether the fume ends up in the filter or in the worker.
Fume is also more than a single hazard, which is why the controls have to be taken seriously. Mild steel fume contains manganese, linked to neurological effects resembling Parkinson's disease. Stainless steel work can release hexavalent chromium, itself a lung carcinogen, along with nickel compounds that can cause asthma. Galvanised steel can produce the flu-like symptoms of metal fume fever. A control regime built only around a cheap extractor and the assumption that mild steel is harmless misses most of this, which is precisely the assumption the 2019 change was meant to end.
A genuine control regime therefore wraps a system around the extraction. That means LEV that is correctly specified and, under COSHH, thoroughly examined and tested by a competent person at least every fourteen months to prove it still performs. It means suitable RPE, face-fit tested to the individual, for residual fume, with a minimum assigned protection factor set to the task. It means training so welders use both correctly, and health surveillance for those regularly exposed, so early signs of harm are caught. The extractor is one component in that system, not a substitute for it.
Where the extractor sits
Seen through the lens of the hierarchy of control for real workplaces, the extractor sits on the engineering rung, above RPE and administrative measures, which is exactly why it carries so much weight and exactly why it has to work. An engineering control that is present but ineffective is worse than useless, because it creates a false sense of safety that discourages the RPE and care that would otherwise fill the gap. Getting the engineering rung right is what lets everything below it do its proper, smaller job.
The bigger air picture
Whatever fume the extraction fails to capture does not vanish; it disperses into the workshop air that everyone on the floor is breathing, welder and non-welder alike. That is the same reason the quality of a building's wider ventilation and ductwork matters to health, as explored in how ductwork affects the air your staff breathe: capture at source is the priority, but the general air is the backstop, and a workshop where fume routinely escapes into shared air is failing its whole workforce, not just the person holding the torch. Controlling welding fume properly protects the room, not only the arc.
Questions
Yes. In 2017 the International Agency for Research on Cancer reclassified welding fume, including mild steel fume, as a Group 1 human carcinogen that causes lung cancer. The UK Health and Safety Executive endorsed this and, in 2019, strengthened its enforcement expectations for all welding, regardless of the metal or the duration of the work.
No. Since the 2019 HSE safety alert, general ventilation is not accepted as adequate control for indoor welding. Suitable engineering controls, typically local exhaust ventilation capturing fume at source, are required, and where they do not fully control exposure they must be supplemented with suitable respiratory protective equipment.
Under the COSHH Regulations, local exhaust ventilation must be thoroughly examined and tested by a competent person at least every fourteen months, and records kept. This is separate from day-to-day checks by the operator, and it is one of the most commonly failed areas at inspection, so it should be diarised and evidenced.
Phoenix Duct Clean · by the numbers
An LEV unit is only a control if it captures at source and passes its examination. Phoenix supports LEV that is tested and proven, not just plugged in. UK-wide.