FireFlex Foam Absorbers are lightweight open cell foams used to absorb sound and reduce echo while providing a Class 1 fire rating . This material is available in various shapes and sizes to meet visual challenges with excellent fire characteristics. Similar to the Polyurethane foams, the thicker the foam, the more sound it will absorb especially in the lower frequency ranges. It is used to reduce room reverberation, prevent comb filtering, and destructive reflections. This material can be applied directly to walls and ceilings.