Metl-Span’s ThermalSafe panels with a nonexposed fastening (NEF) option feature fire-resistant wall construction and smooth surface aesthetics. Its LockGuard interlocking side joints contribute to fire resistance. ThermalSafe NEF mineral wool panels are attached to intermediate support members with concealed clips and fasteners. End panels are attached with through-fasteners required for fire ratings and exposed fastener heads can be covered with trim.
