An import design feature of every MBI Building is sound quieting. We use top grade materials and special construction techniques that will provide you a functionally quiet building that will remain quiet even when the building is placed in a noisy environment.
Interior building noise from the MBI provided air conditioning system is nominally 60 dB. Therefore the external building sound field is usually the driving condition on the interior sound levels. Placing the building mounted HVAC away from the external sound direction will help interior levels.
Reflective interior noise (echo) is generally not a problem in MBI building due to the use of anti-reflective acoustic ceilings.
Note: dB’s are not additive
60 dB + 60 dB = 63 dB
60 dB + 90 dB = 90 dB
OSHA’s 29CFR-1910.95 Hearing Conservation Requirements
Protection against the effects of noise exposure shall be provided when the sound levels exceed those shown in Table G-16 when measured on the A scale of a standard sound level meter at slow response. When noise levels are determined by octave band analysis, the equivalent A-weighted sound level may be determined as follows:
Equivalent sound level contours. Octave band sound pressure levels may be converted to the equivalent A-weighted sound level by plotting them on this graph and noting the A-weighted sound level corresponding to the point of highest penetration into the sound level contours. This equivalent A-weighted sound level, which may differ from the actual A-weighted sound level of the noise, is used to determine exposure limits.
When employees are subjected to sound exceeding those listed in Table G-16, feasible administrative or engineering controls shall be utilized. If such controls fail to reduce sound levels within the levels of Table G-16, personal protective equipment shall be provided and used to reduce sound levels within the levels of the table.
Whenever feasible, employers are required to reduce the noise at the source through engineering solutions. When this is not possible or economically feasible it is acceptable to use hearing protection as a temporary solution. The term hearing conservation as defined by OSHA includes the following aspects, which the employer is responsible to carry out:
In addition to our standard sound protection package, addition sound protection can be engineered and provided by MBI. This can include the following upgrades.