Hearing Protection Device Fitting Flashcards

What is the Noise Reduction Rating (NRR) and how is it used?

Answer: A laboratory-tested attenuation rating used with a correction formula to estimate real-world protection

The NRR is derived from laboratory testing under ideal conditions. A correction formula must be applied to estimate real-world protected exposure levels.

When fitting foam earplugs, what is the correct insertion technique?

Answer: Roll the plug into a thin cylinder, pull the pinna up and back, then insert and hold until expanded

Proper foam earplug insertion requires rolling tightly, pulling the pinna up and back to straighten the canal, and holding in place until fully expanded.

What factor most commonly causes hearing protectors to provide less attenuation than their NRR indicates?

Answer: Improper fit and inconsistent wear by the user

The primary reason for reduced real-world attenuation is improper fit and inconsistent wearing by employees.

What advantage do custom-molded earplugs offer over disposable foam plugs?

Answer: Consistent fit and attenuation due to being shaped to the individual ear canal

Custom-molded earplugs provide a personalized and consistent fit that can reduce variability in real-world attenuation.

When is dual hearing protection (earplugs plus earmuffs) recommended?

Answer: When workplace noise exceeds 100 dBA TWA

Dual protection is recommended when noise levels exceed 100 dBA TWA, as single protectors may not provide sufficient attenuation.

What is the purpose of hearing protector fit testing?

Answer: To measure the actual attenuation an individual achieves with their specific hearing protector

Fit testing measures the personal attenuation rating that each worker actually achieves, identifying individuals who may need refitting.