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Tremco ExoAir LEF is a low-expanding polyurethane foam.


ExoAir LEF is a single-component, CFC-free, all-season, high performance, gun-grade polyurethane foam that performs as a thermal barrier. ExoAir LEF is part of the Tremco T3 building envelope transition toolbox. 

Basic Uses 

The ExoAir LEF is best suited around window and door frame joints but can also be used as an effective joint filler in hidden applications. LEF is most commonly used as a thermal and sound barrier. The product can be installed in temperatures ranging from 14 to 95° F (-10 to 35° C).

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