AFB Evo is the formaldehyde-free version of Roxul's stone-wool batt insulation, Roxul AFB, for new construction and retrofit commercial interior partitions. Made of natural stone and recycled content, a single fire-resistant and water-repellent panel can have a noise reduction coefficient (NRC) of up to 1.1. Panels are offered in two sizes: 48" long by 16" wide and 48" long by 24" wide. AFB Evo comes standard in thicknesses from 1" to 4", in 0.5" increments; it is also offered in 5" and 6" thicknesses.