fischer Firestop Foam Barrier System PLUS is a system of an an innovative two component polyurethane expanding foam and highly elastic mouldable blocks. Both components can by used in conjunction as a system or individually. The quick and easy installation of fischer Firestop Foam Barrier System PLUS means it can be retro fitted as necessary and used with the for more difficult to reach applications. fischer Firestop Foam Barrier System PLUS is available as an UL-version and as an EN-tested version.