... corrode, the life long The feature of fireproof control valve FFH-2, control valve,discharge fume valveIt is applicable to air vents of ... room discharges fume on the system. When the haze temperature achieves 280 automatic closes, achieves the fire protection the ... system. When the haze temperature achieves 280 automatic closes, achieves the fire protection the goal. May control in the room.BSFD ...