By workplace & process
Grain handling throws up a complex dust that is a respiratory sensitiser, linked to farmer's lung and occupational asthma. Where local exhaust ventilation fits in dusty agricultural settings, and what its test has to confirm.
The short answer
Grain and agricultural work generates a complex dust that is a respiratory sensitiser and is linked to farmer's lung, occupational asthma and long-term lung disease. It is also generated in some of the hardest settings to control - open barns, intake pits and mobile plant - which makes fixed local exhaust ventilation at the key handling points all the more valuable. Where it is fitted, the test confirms it is still doing its job.
The detail
Grain dust has a workplace exposure limit of 10 milligrams per cubic metre as an eight-hour average, but because it is a respiratory sensitiser the duty is to keep exposure as low as reasonably practicable below that, not simply under the number. It is linked to occupational asthma, chronic bronchitis and COPD, to extrinsic allergic alveolitis such as farmer's lung, and to grain fever. Agriculture's occupational asthma rate is around double the national average.
The dust is more than the grain itself. It carries fungal spores, bacteria, endotoxins, mites and animal dander, which is part of why it provokes such a range of respiratory illness. It is produced wherever grain is moved and disturbed - intake pits, augers and conveyors, dressing and cleaning, drying, milling and bagging - and in quantity it also brings a dust-explosion risk that shapes how plant is designed and extracted.
What it means for you
Where local exhaust ventilation serves fixed handling points - intake, cleaning, drying and bagging plant - a thorough examination and test confirms it is capturing the dust at source and moving air at the commissioned rate, at least every fourteen months with user checks between. That fixed plant is where source capture is realistic and worthwhile, and where the test can meaningfully prove performance.
The harder settings - open barns and mobile equipment - rely more on enclosure, good working practice and respiratory protection, but that does not excuse the fixed extraction from being tested. Proving the plant still captures the dust, rather than assuming it does because it once did, is what protects a workforce whose lungs are already carrying a heavy dust load. Seasonal peaks matter here too, since harvest and intake concentrate the dustiest work into short, intense periods when the extraction is worked hardest and any shortfall shows.
The service behind the guide
We test agricultural and grain-store LEV at intake, augers, drying and bagging against the dust it has to control, with a clear report and remedial actions.
Questions
Grain dust has a workplace exposure limit of 10 milligrams per cubic metre as an eight-hour average. Because it is a respiratory sensitiser, exposure must be kept as low as reasonably practicable below that, not simply under the limit.
It is linked to occupational asthma, chronic bronchitis, COPD, extrinsic allergic alveolitis such as farmer's lung, and grain fever. Agriculture's occupational asthma rate is around double the national average.
From intake pits, augers and conveyors, dressing, drying, milling and bagging. It is a complex dust that also carries fungal spores, endotoxins, mites and dander, which adds to the respiratory risk.
At fixed points - intake, cleaning, drying and bagging plant - yes, and that is where source capture pays off. It is harder around open barns and mobile equipment, where enclosure, good practice and respiratory protection also play a part.
At least every fourteen months under COSHH, with user checks between. The test confirms the extraction at each handling point is still capturing the dust as designed.
Phoenix Duct Clean · by the numbers
We test agricultural and grain-store LEV at intake, augers, drying and bagging against the dust it has to control, with a clear report and remedial actions.