Attenuation

Introducing a barrier or enclosure such as a wall in the path. Barrier can be prepared from the plywood, wall board of adequate strength. Enclosing a machine protects other workers from its noise, but does not benefit the worker employed on the machine itself. Depending on the need enclosure may be complete or partial to provide a shadow to the worker who would otherwise be directly exposed to noise. Complete enclosures have been tried on power presses deburring machines, paper shredding machines where large deduction of noise level ranging from 20 to 40 dB have even obtained.