Pass-It® Transit System is a pre-assembled, multi layered reactive intumescent device encased in a 2 part powder coated steel shell. It is designed to prevent the passage of fire between compartment floors and walls, whilst still allowing for the easy installation and removal of services without destruction of the seal. There are a wide range of different sizes available depending on the number and size of the services required to penetrate. It can be formed into a modular grid or linear format, allowing an easy route for services to travel.