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How can ventilation reduce exposure to harmful workplace dusts and vapours?
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occupational disease
The lung disease asbestosis is caused primarily by prolonged inhalation of asbestos fibers. It occurs mainly among workers whose occupations involve exposure to asbestos and people who live near mines, factories, and construction sites.
Ventilation is a critical strategy for mitigating occupational disease by controlling the concentration of hazardous substances in the workplace. It functions through two primary mechanical approaches:1
- Positive Pressure Systems: By using a mechanically powered air inlet, these systems create a slight positive pressure within a space. This ensures that any air leakage is directed outward, keeping internal environments, such as offices located within industrial facilities, free from dust or fumes.1
- Negative Pressure Systems (Mechanical Exhaust): These systems use a mechanical exhaust to create a slight negative pressure, causing air to leak inward. This is highly effective for containing contaminants like grinding dust, paint spray, and smoke at their source, preventing them from spreading to surrounding areas.1
Additionally, mechanical ventilation systems often incorporate filters to remove particulate matter from the air. For more complex industrial environments, specialized equipment such as cyclones, wet scrubbers, and electrostatic precipitators can be integrated to collect fine particulates and manage hazardous vapours based on specific airstream characteristics.12