Do you know function of the spring in fire damper?

source：Qianye Precision time：2022-9-14

What do you think when you see the fire damper? I believe many people will think of “fire”. In fact, the word “fire” must be familiar to everyone! What do you think of when you hear this word? People trapped by the raging fire? Or the scene of our brave firefighter uncle fighting the fire? The following are the fire events in recent days.

At 14:00 on March 12, 2022, a fire broke out in the oil fume pipeline of a hotel in Huazhou City. At 3:46 on March 8, 2022, a fire broke out at the construction site of Jinke Xiangsheng Yueyuan at the intersection of chegang road and Xiyun road in Zhenjiang new area. In the early morning of March 14, 2022, a fire broke out in Kundulun District of Baotou City, which has killed 7 people so far. Do you feel very sad at this time?

Uncontrolled fire is always a serious risk. In an emergency situation a fire can spread via a ventilation ductwork. Therefore it is essential that the ventilation ductwork is equipped with high-quality and robust fire dampers that also prevent smoke from spreading and therefore enable safety for escape routes. But what is a fire damper?

Fire Dampers are used in air transfer openings, ducts and other places where fire rated structures (e.g. walls, floors or other fire barriers) are penetrated. If these openings wouldn’t be protected, the fire would easily spread to other spaces and damage the property and pose a danger to people working/being in this environment. The idea of compartmentation is to keep the fire in the start point and prevent it from spreading to other locations. This helps to limit & extinguish the fire and minimize the total damages to the facility and environment.

Fire itself is not the only threat in fire related accidents. Smoke and other gases released in the fire can pose a great danger to people especially in environments where different chemicals are being produced or stored. These gases spread fast and depending on the substance, even small doses can be extremely dangerous or fatal to people. Special seals can be used in fire dampers to obtain gas tightness to stop these harmful gases from spreading in addition to fire protection.

The operation of fire dampers is simple: they close when the temperature in the room or space rises over the threshold limit to prevent the fire from spreading. Halton fire dampers have fusible link, which is selected according to desired temperature. Once this temperature is reached, damper closes.

In electric and pneumatic actuated dampers, fusible link releases and cuts off operating voltage to the spring return motor, allowing the spring to close the damper blades. The fire damper opens automatically when the fuse has been changed and the operating voltage to the motor is re-established. In spring operated dampers, fusible link releases allowing the spring to close the damper blades. When the fuse has been changed, the fire damper must be reset into open position manually,so spring plays a very important role in fire damper.

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