HARBOR FREIGHT 58353 Foldable Ear Muff Instructions
- June 6, 2024
- HARBOR FREIGHT
Table of Contents
58353 Foldable Ear Muff
Instructions
FOLDABLE EAR MUFFS
The EPA has selected the NRR as the measure of a hearing protector’s noise- reducing capabilities. Harbor Freight Tools makes no warranties as to the suitability of the NRR as a measure of actual workplace protection since such protection is highly dependent on user training, motivation, and utilization. A better estimate of workplace protection can be obtained by derating the labeled NRR by 50%.
The NRR calculated from this attenuation data is 26 dB. Improper fit of this
device will reduce its effectiveness in attenuating noise. Consult
instructions for proper fit.
The level of noise entering a person’s ear, when a hearing protector is worn
as directed, is closely approximated by the difference between the A-weighted
environmental noise and the NRR.
ATTENUATION DATA ANSI S3.19-1974
| Test Frequencies (Hz) | 125 | 250 | 500 | 1000 | 2000 | 3150 | 4000 | 6300 | 8000 | NRR |
|---|---|---|---|---|---|---|---|---|---|---|
| Mean Attenuation (dB) | 17.2 | 23.3 | 32.4 | 39.1 | 35.5 | 34.9 | 38.3 | 36 | 34.6 | 26 |
| Standard Deviation (dB) | 2.2 | 2.4 | 3.2 | 3.3 | 2.5 | 3 | 3.4 | 3 | 2.9 |
Example:
- The environmental noise level as measured at the ear is 92 dBA.
- The NRR is 26 decibels (dB).
- The level of noise entering the ear is approximately equal to 66 dBA.
CAUTION! For noise environments dominated by frequencies below 500 Hz,
the C-weighted environmental noise level should be used.
The NRR used in the above example was achieved under laboratory conditions.
Although hearing protectors can be recommended for protection against harmful
effects of impulsive noise, the Noise Reduction Rating (NRR) is based on the
attenuation of continuous noise and may not be an accurate indicator of the
protection attainable against impulsive noise such as gunfire.
Wear Instructions
- Adjust the band to the proper position.
- Pull hair out of the way and out from beneath the muffs.
- Adjust the height of the cups so they fully enclose the ears and the cushions press equally around the ear.
- It is important that cushions seal completely around the ear.
- Always wear ANSI-approved safety glasses when working with tools and equipment. When using these earmuffs with safety glasses, the safety glasses must have thin temples that fit closely around the head or thin straps, this will help ensure a good fit and better protection.
SAVE THESE INSTRUCTIONS.
UPC 193175473110
Documents / Resources
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HARBOR FREIGHT 58353 Foldable Ear
Muff
[pdf] Instructions
58353, Foldable Ear Muff
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