Handling dry allergens such as powders, nuts and dusts creates additional risks associated with the movement of air that may carry particles of allergens. Since a small number of sufferers react to extremely small amounts of allergens, care needs to be taken where there are excessive amounts of dust to ensure other products are not 'contaminated' with this dust. Air conditioning needs to be installed to prevent air containing dust particles being transferred to a separate part of the production facility and allergens being transferred with it.
In extremely dusty environments, such as nut roasting plants, additional care needs to be taken to prevent allergens being transferred on clothing from one part of the factory to another. On entering the high-risk area employees and visitors should be required to wear special protective clothing such as full body suits and hair cover. On leaving the specific area the protective clothing should be removed to prevent any transfer of allergens to another area of the factory.
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