◆材质：镀锌钢板

◆特性：

1、平时为常开状态，当阀门内温度达到70度时，易熔片熔断，阀门在弹簧力作用下关闭，切断烟气沿风管蔓延。阀门平时可做风量调节阀适用，有六档风量调节。

◆Material: galvanized steel

◆Features:

1. Normally open state. When the temperature inside the valve reaches 70 degrees, the fusible piece is blown, the valve is closed under the action of the spring force, and the flue gas is cut off along the air duct. The valve can be used as an air volume control valve in general, and has six air volume adjustments.