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• A check should be made on pipe velocity in dust collection systems to ensure that ducts
will remain free of dust settlement.
• Air cleaning plant and fans should be checked for continued compliance with the design
specification.
• Planned preventive maintenance – may include replacing filters, lubricating fan bearings and
inspecting the fan motor.
• Periodic testing – to ensure that air velocities through the system are adequate. This can
be done by visual inspection of the intake hood using a smoke stick, measuring air
velocities at the intake and in the ductwork using anemometers, and measuring static
pressures using manometers and pressure gauges.
Components of a Basic System
The components of a basic system are:
• Hoods to collect airborne contaminants at, or near, where they are created (the source).
• Ducts to carry the airborne contaminants away from the process.
• Air cleaner to filter and clean the extracted air.
• Fan must be the right size and type to deliver sufficient 'suck' to the hood.
• Discharge the safe release of cleaned, extracted air into the atmosphere.
Components of a basic system
ENSIGN| Unit IG2 – Element 7 – Chemical and Biological 37
Agents
