When using multiple fans with the same noise level, is there a way to calculate the total noise level?

Multiple fan noise calculation

It can be calculated as follows:

Combined noise level [dB] = noise from one fan + 10 log n
n: number of fans

Example: When using two 40 [dB] fans

Combined noise level [dB]= 40 + 10 log 2
= 40 + 3
= 43 [dB]