Smoke & Fire Damper is mounted on smoke exhaust ducts and normally open; it will automatically close when duct temperature reaches 280℃ and can be manually opened and reset. It can be electrically opened via DC24V±2.4V signal, outputs feedback signal after operation and supports interlock with other equipment as required. Its fuse operates at 280℃ with fire resistance rating of 1.5h, full-open resistance coefficient less than 0.5, control voltage DC24V and operating current less than 0.7A for smoke exhaust and fire prevention.