The A-60 Marine Fire Damper is tested and Bureau Veritas approved for fitting to Class A-60 Divisions (bulkheads and decks). It is constructed with aerodynamic stainless steel interlocking parallel blades and closes upon high temperature or loss of electric power connection. The A-60 is fitted with an electrical thermal release device (ExPro-TT) which includes a manual test switch that allows periodic operation of the damper for testing purposes.