Is the smoke exhaust fire damper normally open or normally closed? Function of the smoke exhaust fire damper.

　　If our home uses heating in winter, we must install a boiler to heat the radiators. Generally, the boiler has a smoke exhaust fire damper, and we can first check whether the smoke exhaust fire damper is normally open or normally closed. For those using a boiler for the first time, it may not be clear what to do. Additionally, some people may not know the function of the smoke exhaust fire damper.

　　Is the smoke exhaust fire damper normally open or normally closed?

　　The smoke exhaust fire damper should be normally open, as referenced in GB15930-2007. The 2007 07K103-1 Architectural Smoke Control and HVAC Fire Protection Design Atlas is inconsistent with GB15930-2007. The atlas also includes 280-degree normally open and normally closed smoke exhaust fire dampers. According to the national standard for smoke exhaust dampers, it should be normally open. I consulted with professionals from the Beijing Fire Department: if the smoke damper is installed on a duct that serves both exhaust and smoke, it is definitely normally open; if installed on a smoke duct, it is normally closed, which is controversial. However, since there are national regulations, we should follow the regulations.

　　Netizens' opinions: Whether the smoke exhaust fire damper is set to normally open or normally closed depends on the type of smoke outlet: when a normally closed smoke outlet is set, a normally open smoke exhaust fire damper is installed on the smoke branch; when a regular normally open air outlet is set, a normally closed smoke exhaust fire damper is installed on the smoke branch; when a normally closed dedicated fire smoke outlet is set, no smoke exhaust fire damper is installed on the smoke branch.

　　Function of the smoke exhaust fire damper

　　1. Normally open smoke exhaust fire damper functions as follows:

　　1. It remains normally open, and during a fire, the damper stays open.

　　2. When the duct temperature reaches 280℃, the fuse operates, and the damper automatically closes.

　　3. It outputs a damper closure signal, interlocking to stop the smoke exhaust fan.

　　4. Manual closure and manual opening.

　　2. Normally closed smoke exhaust fire damper functions as follows:

　　1. It remains normally closed, and during a fire, the control center inputs a DC24V power supply, and the damper quickly opens.

　　2. It outputs a damper opening signal, interlocking to control the fire smoke exhaust fan.

　　3. Manual opening. Manual reset to close.

　　4. When the duct temperature reaches 280℃, the fuse operates, and the damper closes again.

　　3. Remote control smoke exhaust fire damper (cable control type) functions as follows:

　　1. It has all the functions of a normally closed smoke exhaust fire damper.

　　2. It can be manually opened and manually reset to close from a distance.

　　3. The standard control distance for the cable is 6m (longer lengths can be customized).

　　4. Automatic reset smoke exhaust fire damper functions as follows:

　　1. It remains normally closed, and during a fire, the control center inputs a DC24V power supply, and the damper automatically opens.

　　2. When the duct temperature reaches 280℃, the fuse operates, and the damper automatically closes.

　　3. It can be manually opened.

　　4. After the damper opens, no manual reset is needed; as long as a DC24V power supply is input, the damper can automatically reset to its original closed position (this function is only available before the temperature sensor operates; if the sensor operates, it needs to be replaced to use this function).

　　Through this article, we mainly learned whether the smoke exhaust fire damper is normally open or normally closed. The smoke exhaust fire damper should be normally open, so when using the boiler for the first time, remember to keep the fire damper normally open. It is important to remember this, as closing it may affect heating. Additionally, the article also informs us of the functions of the smoke exhaust fire damper.