Most of the time, hearing protection equipment (EPA's) are used by workers in industries exposed to various sources of noise for a long period of time. More than once the acquisition of such equipment by the employer, to be adopted without a previous analysis of its power of attenuation, was established the objective of analysis, through a case study, the efficiency of the hearing protectors, to the spectrum of bands of octave, and to the sound pressure levels applied in mechanical manufacturing processes, not belonging to a company located in Manaus. In the present work, four sources of noise were studied: Angular sander process, Cutting bench process, Process of polytton saw for aluminum and Process of the poly-cutting saw for steel. For data collection, in each of the processes, the equipment was used with octave band filter, where it was launched in the operator's hearing zone, in a radius of 150 ± 50 mm, originating from the auditory canal. Soon after the information was collected by the equipment during an execution of each process, the results were extracted through a computer program, where a thorough analysis was performed. The results of the collection demonstrate that for the Angle Grinder process, the CA 5745 hearing aid that was used in the four analyzed processes was able to meet the parameters established in the NR-15 and NHO01 standards, effectively attenuating the noise inherent in this process. process. However, it is also observed for the process of process analysis: cutting bench process, process of the police saw for aluminum and process of the police saw for steel, the hearing protector of CA 5745 did not meet the parameters established by NR-15 and NHO-01. On the other hand, the shelltype hearing protectors of CA 15624 and CA 32841 were the only protectors analyzed that were able to efficiently attenuate the routers in each of the last three processes.
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