Noise Reduction Rating Formula – What Is It?

By Monica Cohen, November 11th, 2010

In order to calculate the amount of noise reduction ear plugs provide, manufacturers such as HEAROS use a noise reduction rating formula. This number is required by Federal law to be shown in order to inform consumers of the level of noise ear protection is rated for. The noise reduction rating assumes the minimum protection the ear plugs offer as demonstrated by 98% of subjects in the testing process.

It is important to choose ear plugs that are rated for the level of noise that will be experienced. Wearing ear plugs that are rated too high for the noise levels often leads to improper placement or adjustment of the ear plugs. This is often done to prevent sound from being muffled. This improper placement can lead to hearing damage as the ear is not fully protected.

The noise reduction rating formula can be compared to SPF rating for sunscreen and sunblock in that it is a fair and average measurement of the protection provided. As with sunscreen and sunblock, this number is considered across the board, and individuals may have different needs for protection. HEAROS offers a number of ear plugs with different noise reduction ratings that comply with the standard noise reduction rating formula.

From ear plugs for every day noises to high noise reduction rated ear plugs for concerts and industrial noises, HEAROS has an ear plug suitable for just about everyone. Some ear plugs may be rated for casual situations such as libraries or other areas of study that can protect and dampen sounds to provide a quiet study environment. Other ear plugs, such as high noise reduction rated concert ear plugs, provide high levels of protection to preserve hearing and prevent further damage. For example, HEAROS Xtreme Protection Series has an NRR of 33 – the highest in the industry.

Even those who swim can find ear plugs from HEAROS to fit their needs. While ear plugs for swimmers are not designed to protect against noise levels, they can prevent ear damage by keeping water out of the ears. This can prevent clogged ears and infection as the ear plugs prevent fluids and debris from entering the ears.

Hearing damage can often be irreversible, and it is important to take all precautions to preserve hearing. Wearing noise reduction ear plugs from HEAROS is a very comfortable and easy way to preserve hearing and prevent further damage.

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