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Answer :
The sound pressure level produced within the roof void as a result of the plant room noise is calculated to be 48 dB.
To determine the sound pressure level in the roof void, we utilize the sound reduction index of the plant room wall and the sound pressure level in the plant room. The formula used for this calculation is L2 = L1 - R, where L2 represents the sound pressure level in the roof void, L1 denotes the sound pressure level in the plant room, and R signifies the sound reduction index of the plant room wall adjoining the roof void. Given that the sound pressure level in the plant room is 61 dB and the sound reduction index of the plant room wall is 13 dB, we substitute these values into the formula to find the sound pressure level in the roof void:
L2 = 61 dB - 13 dB
L2 = 48 dB
Hence, the sound pressure level produced within the roof void as a result of the plant room noise is determined to be 48 dB. To further reduce the sound pressure level from the plant room to the adjacent rooms, there are several recommended strategies. One approach is to improve the sound insulation of the common wall between the plant room and the adjacent rooms. This can involve increasing the sound reduction index of the wall by adding sound-absorbing materials or panels, or enhancing the sealing of any gaps or openings to minimize sound leakage.
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