poapredearfreed1987

Scroll down to view results Local exhaust systems are used to control air contaminants by trapping them at or near the source, in contrast to dilution ventilation which lets the contaminant spread throughout the workplace. Local exhaust is generally a far more effective way of controlling toxic contaminants before they reach the worker's breathing zones. This type of system is usually the preferred control method if: The following;documents;may be

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