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- Compare and contrast three methods of noise control. Which control method would you recommend for controlling exposure to a fan motor producing an eight-hour TWA noise exposure to an operator at 92 dBA?
- OSHA currently enforces an eight-hour, time-weighted average (TWA) PEL of 90 dBA, and uses a 5 dB exchange rate. NIOSH recommends an eight-hour TWA exposure limit of 85 dBA and a 3 dB exchange rate. The 85 dBA limit and 3 dB exchange rate is also used as
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