#### HVAC Acoustic Fundamentals

Using Table 1 Decibel Addition Chart Between L1 and L2, there is a difference of 2 dB so add 2 dB to L2 for a total of 84 dB. Between 84 dB and L3, there is a difference of 0 dB so add 3 dB to 84 dB for a total of 87 dB. Between 87 dB and L4, there is a difference of 6 dB so add 1 dB to L4 for a total of 94 dB. Between 94 dB and L5, there is