Harbor Freight Tools Foldable Ear Muffs Product manual

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 25. 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.

tseT

naeM

dradnaS

Example:

1.) The environmental noise level as measured at the ear is 92 dBA.

2.) The NRR is 25 decibels (dB).

3.) The level of noise entering the ear is approximately equal to 67 dBA. CAUTION For noise environments dominated by frequencies below 500 Hz, the C- weighted

environmental noise level should be used.

521052005000100020513000400360008RRN

)zH(seicneuqerF

34.5-22.

)Bd(noitaunettA

13.105.026.010.191.176.048.171.133.1

)Bd(noitaiveD

4791-91.3SISNAATADNOITAUNETTA

4117.8136.1403.4479.2361.0314.1450.33

ITEM 94334

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

1. Adjust the band to the proper position.

2. Pull hair out of the way and out from beneath the muffs.

3. Adjust the height of the cups so they fully enclose the ears and the cushions press equally around the ear.

4. It is important that cushions seal completely around the ear.

5. Always wear ANSI-approved safety glasses when working with tools and equipment. When using these ear muffs 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.

Made in China.