By workplace & process
Bakers face the highest rate of occupational asthma of any trade. The extraction that holds flour dust down is the protection - and a test is how you know it still works.
The short answer
Bakers have the highest rate of new occupational asthma of any occupation, and flour dust together with the enzymes in bread improvers is the cause. Once a baker is sensitised, even a small amount of flour dust can trigger an attack, and the sensitisation is often permanent - so someone can be forced out of the trade entirely. The extraction that holds flour dust down is the protection, and a test is how you confirm it is still delivering it.
The detail
Flour dust is a respiratory sensitiser. Repeated inhalation can change a baker's airways into a hypersensitive state, producing bakers' asthma, along with rhinitis, conjunctivitis and sometimes dermatitis. The critical feature is that once sensitised, the response can be triggered by exposures far below the workplace exposure limit - which is why control is judged not by the limit alone but by how far below it you can reasonably get. Good practice should keep exposure below 2 mg per cubic metre, and the sensible aim is lower still.
The dust comes from predictable places: tipping sacks, dusting benches and tables, sieving, and mixing. These are where extraction earns its place. Low-dust flours, careful handling and avoiding practices that throw dust into the air all help, but where dust is generated, local exhaust ventilation at that point is the engineering control that keeps it out of the breathing zone. Health surveillance sits alongside, catching early symptoms before they become established disease.
What it means for you
A thorough examination and test of bakery LEV checks that the extraction at each dust-generating point is capturing effectively, that ducts and fan are moving air at the rate they were commissioned to, and that filters and collectors are sound - at least every fourteen months. In a bakery the examiner also has to account for a warm, sometimes humid environment and the need to keep the system hygienic.
The common failing is capture that has weakened at a busy tipping or dusting point, leaving a visible haze of flour hanging in the air where someone is working. Because the harm is cumulative and the sensitisation permanent, that quiet loss of capture matters - and catching it through testing, before it shows up as a new asthma case, is exactly the point of the exercise.
The service behind the guide
We test the LEV on tipping, dusting and mixing points against the capture and airflow it must achieve, and report on any remedial work needed.
Questions
Flour dust and the enzymes in bread improvers are respiratory sensitisers. Repeated inhalation can change the airways into a hypersensitive state, and bakers have the highest rate of new occupational asthma of any occupation.
Because once a baker is sensitised, exposures far below the workplace exposure limit can trigger an attack. Good practice keeps flour dust below 2 mg per cubic metre, and lower is better.
Predictable points: tipping sacks, dusting benches, sieving and mixing. These are where local exhaust ventilation earns its place, capturing dust at the point it is generated.
Often not. Once sensitised, a baker may react to even small amounts of flour dust for good, which can force them out of the trade. That is why controlling exposure and running health surveillance matter so much.
At least every fourteen months under COSHH, with weekly user checks in between, so capture at the dust-generating points is proven against the commissioning benchmark.
Phoenix Duct Clean · by the numbers
We test bakery LEV against the exposure control it must deliver at tipping and dusting points, and report clearly. Call or email to book.