Hearing Conservation. and Noise Control. WHY??????. It’s the LAW Quality of Life Gradual / Painless. Anatomy of the Ear. Pinna. Semi-Circular Canals. Auditory Nerve. Cochlea. Hammer-Anvil-Stirrup. Types of Hearing Loss. Conductive Central Sensorineural. Degree of Risk. Frequency
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Noise exposure 92 dBA
Manufacturer’s NRR 32
32 – 7 = 25 (effective noise exposure reduction)
92 – 25 = 67 dBA
85 - 89 dBA