NICET Fire Alarm Systems Level 4NICET Fire Alarm Systems Level 4 Level IV FAS Technicians are senior level technicians whose work includes installing and maintaining complex* and specialized systems. Level IV Technicians manage multiple projects at once and serve as liaison between AHJs, owners, engineers, contractors. They interpret codes, supervise Levels I III Technicians, and take ownership of programs and training. Level IV Technicians have at least 10 years of experience in