Three ventilation fans are installed in an industrial area. the produced sound pressure

Three ventilation fans are installed in an industrial area. the produced sound pressure levels are 86 db, 90db, and 85 db for fan 1, fan 2, and fan 3 respectively. if all three are working at the same time what would be the sound pressure level?
is the sound levels accepted according to osha standard for 8 hr exposure?
o in the range of 88db -90 db / accepted
o in the range of 88db -90 db / not accepted
o in the range of 90 db-93 db / accepted
o in the range of 90 db-93 db /not accepted