When it comes to dB's, 2 and 2 don't make 4. To help you add in dB's, use the handy calculator below: For example, the noise level at a house due to a neighbouring factory is 43dB(A). The factory intends installing a new chiller unit which will contribute 45dB(A) at this house. Then the overall noise at the house will be 43dB(A) + 45dB(A) = 47dB(A). |