A Transit System is a means to maintain the integrity of a firewall,bulkhead or deck through which cables pipes and other services pass.The transit system will seal against and exhibit resisitance to fire,EMC,water,radiation,gas,chemicals,explosion,ultra violet light,smoke,vermin.Wherever a wall or bulkhead is penetrated by a cable or pipe the occupants and integrity of the structure are exposed to risk from hazards such as fire and smoke, water ingress, toxic gases and attack by vermin.
