How much is the decibels while the whole set of animal feed plant is on running?

The decibels of each machine on running are as follow: hammer mill is about 100 decibels, pellet mill 90 decibels, vibrating screen 90 decibels, fan 80 decibels, and elevator 80 decibels. All the statistics are estimated based on experiences but not on practical test, which can be recollected and verified on the trial running.