Fire dampers are widely used in various buildings as a control method that utilizes the gravity of the pipeline and the elastic action of the equipped springs to block the valve, block smoke or dust, and prevent the spread of fire when it is difficult to achieve smooth smoke exhaust in the event of a fire. There are three differences between common fire dampers and smoke exhaust fire dampers: different degrees of closure, different installation positions, and different opening states.
1. Different degrees of closure
Fire dampers and smoke exhaust type fire dampers not only have different positions, functions, and device structures, but also have different closing temperatures. Fire dampers are generally used for smoke prevention, so they need to automatically close at 70 ℃ to isolate external smoke and dust pollution. Therefore, they are also known as 70 ℃ fire dampers or simply referred to as fire dampers. The smoke exhaust type fire damper is mainly used to eliminate smoke and dust. In order to avoid affecting personnel's escape when there is smoke and dust, it is usually closed at 280 degrees Celsius. Due to withstanding the high temperature of 280 degrees Celsius, it is also called a high-temperature fire damper.
2. Different installation positions
Fire dampers are mainly placed in the structure of ventilation and air conditioning systems, commonly found in ventilation ducts. Their function, as the name suggests, is to prevent smoke and dust from spreading to other places in a fire, and to prevent smoke and fire from being blocked. Its principle is to perceive the thermal energy in fireworks and use fireworks detectors to identify the smoke and dust content in the location. Therefore, it needs to be installed in ventilation ducts to facilitate the detection of smoke and dust. The smoke exhaust fire damper is generally installed in the smoke exhaust pipeline, and its main function is to eliminate smoke and dust generated by the fire. The principle is to use wind pressure to discharge high concentration smoke and dust outside the building using pressure drop. Therefore, installing it in the smoke exhaust pipeline is conducive to centralized emission, thereby ensuring the qualified air quality of the internal building.
3. Different opening status
To prevent smoke and dust from entering, the fire damper is usually closed and cannot be opened arbitrarily, otherwise it will cause indoor environmental pollution. In the case of smoke prevention, in order to isolate smoke and dust, the fire damper can be manually opened to prevent emergency situations from causing indoor air circulation. The smoke exhaust and fire damper is mainly used to remove smoke and dust from the premises, so it is usually opened. Closing it casually can cause indoor air blockage. The smoke exhaust and fire damper will only automatically close when the fire reaches 280 degrees Celsius. In the presence of smoke and dust, it is not possible to manually open it in order to eliminate high concentration of smoke and dust inside, which is also for safety reasons.