1.1 PERMISSIBLE NOISE LEVELS (Lr)
The key factor in designing a silencer installation is the (permissible) required
noise level Lr, which has to be specified by the customer.
Please note that the design noise level must conform to both user
requirements and local legal limits and regulations, in particular such
regarding acceptable (occupational) noise exposure.
NOTE: If unsure about applicable requirements and standards, we recommend limiting the
sound power level according to the US Occupational Noise Exposure standard OSHA
1910.95.
Personnel Noise Protection Requirements
(excerpted from OSHA 1910.95 and 2003/10/EC)
When employees are subjected to sound levels exceeding those listed in the
table below, feasible administrative or engineering controls shall be utilised. If
such controls fail to reduce sound levels to within permissible levels, personal
protective equipment shall be provided and used to reduce sound levels to
within the prescribed levels.