Phoenix Journal · LEV Testing
Occupational lung disease has a long latency, so a healthy young worker today can carry the highest long-term risk of all. Here is why - and how LEV testing keeps that risk in check.
Occupational health
A young cook or kitchen porter can breathe in flour dust, cleaning vapours and cooking fumes every shift for years and still feel completely well - which is exactly why the risk is so easy to miss.
The uncomfortable truth about occupational lung disease is that it rarely announces itself early. Most of these conditions have a long latency, which means the damage builds quietly over years or even decades before symptoms appear. The Health & Safety Executive estimates that around 11,000 lung disease deaths each year in Great Britain are linked to past workplace exposures - and those deaths reflect working conditions from decades ago, not last week. A worker in their twenties today is effectively writing a health cheque that may not be cashed until they are in their fifties or sixties.
That delay creates a dangerous illusion. A young person with healthy lungs has plenty of spare capacity, so a bad shift near a smoky grill or a dusty flour store produces no obvious cough, no wheeze, nothing that would make anyone stop and think. But the biological insult is still happening. Fine particles lodge deep in the airways, sensitising agents prime the immune system, and irritant gases inflame delicate tissue. None of it is visible, and none of it hurts - yet.
There is also a simple maths problem. Someone who starts kitchen work at 18 has potentially 45 or more years of exposure ahead of them. The longer the exposure, the higher the cumulative dose, and the greater the odds of crossing the threshold into disease. Younger workers are not more fragile than older ones - in many cases they are the opposite - but they carry the longest runway of future exposure, and that is the risk that gets overlooked.
In a busy commercial kitchen, the hazards do not look dramatic. They are the ordinary parts of the job that everyone stops noticing after the first week.
The pattern in the data is striking. Current asthma prevalence is highest among workers aged 18 to 24, at around 9.3 per cent - the very group least likely to connect a hazard today with a diagnosis decades from now. And this is not confined to kitchens: the same principle links workplace dust to chronic lung conditions across many trades, which we cover in our piece on the long-term link between workplace dust and COPD.
Local exhaust ventilation - the canopies, hoods, ducting and fans that capture contaminated air at source - is one of the few controls that removes a hazard before anyone breathes it in. But an LEV system is only protective if it still works, and systems drift out of tune over time. Grease loads up in ductwork, filters clog, fan belts slip, dampers stick and capture velocities quietly fall away. A canopy that looked effective on the day it was commissioned can be moving a fraction of the air it should be a few years later, while looking exactly the same to the people underneath it.
This is why the law does not leave it to chance. Under Regulation 9 of the Control of Substances Hazardous to Health Regulations 2002 (COSHH), any LEV system used to control exposure must be thoroughly examined and tested by a competent person at least once every 14 months. For certain higher-risk processes, Schedule 4 sets much shorter statutory intervals - as little as one month or six months. A thorough examination and test is far more than a quick look: it checks the system against its original design performance, measures capture and face velocities, inspects the ducting, and confirms the system is still doing the job the risk assessment relied on.
For a young worker, that test is the difference between an extraction system that is genuinely pulling fumes and dust away from their face and one that is merely making a reassuring noise. It also feeds the wider COSHH picture: the risk assessment under Regulation 6, the control hierarchy under Regulation 7, exposure monitoring against the workplace exposure limits published in HSE's EH40, and health surveillance where it is required. LEV testing is the evidence that the control at the heart of all that is actually holding.
Protecting younger workers is not about wrapping them in cotton wool - it is about making sure the controls that surround them are honest. Because the payback on these conditions is so delayed, the only sensible strategy is to act while everyone still feels fine. A few practical priorities make the biggest difference:
The exposures in a commercial kitchen are ordinary, the symptoms are absent, and the timeline is long - which is precisely the combination that lulls employers into leaving things as they are. A young workforce is the strongest argument for getting your ventilation checked, not the weakest. Their lungs have the most years left to protect, and the controls you verify today are the ones they will thank you for in thirty years' time.
Questions
Yes. Most occupational lung diseases have a long latency, meaning damage builds quietly for years or decades before any cough, wheeze or breathlessness appears. Healthy young lungs have spare capacity that masks the early insult, so the absence of symptoms is not evidence that exposure is under control. That is exactly why controls like local exhaust ventilation need to be verified now, not once problems show up.
Under Regulation 9 of COSHH, any LEV system used to control exposure must be thoroughly examined and tested by a competent person at least once every 14 months. Some higher-risk processes listed in Schedule 4 require much shorter intervals, such as one or six months. The test measures whether the system still meets its original design performance, so it should be booked in on a schedule rather than left until something visibly fails.
Phoenix Duct Clean · by the numbers
Phoenix examines and tests local exhaust ventilation to HSG258 and COSHH - measured, reported and certificated, UK-wide.