Once static fire dampers close, no air can pass through the ducts. Dynamic fire dampers also cut off airflow to a fire and protect your building from fire damage. However, the way they are triggered to shut, and where you typically find them, is different than static fire dampers. Dynamic fire dampers are typically found within the vertical barriers of your HVAC system. Dynamic fire dampers are spring-loaded, which is how they shut. In the event of a fire, the HVAC system where the dynamic fire dampers are placed will continue to operate.
Since a dynamic fire damper will need to shut against circulating air, they have built-in fans that turn on to activate the spring-loaded system. Smoke dampers help to slow the travel of smoke during a fire. They stop the air from circulating, trapping the smoke and allowing people to get out of the building.
This also allows first responders to contain smoke and fire damage. Combination dampers are just what they sound like; they combine smoke and fire dampers into one. They try and keep damages to a minimum. They give firefighters a chance to get to a building and are designed to help individuals get out of a home or office safely. It's so important to read up on the latest building codes when you are installing fire dampers in a building.
They are designed to help keep buildings and individuals safe, and can only do so when they are installed correctly. We all like to feel safe when we are at home, or working in our office. It's a good feeling to know that when you have dampers installed in your building correctly, you should have enough time to get out before the entire thing goes up in flames. By keeping up with the latest rules and regulations with fire dampers, you are doing your part to keep you and your loved ones safe from any potential fires which hopefully don't come your way.
If you found this helpful in answering the question of what is a fire damper, please share it on social media. Also, remember to save on Shoemaker here at PlumbersStock. Connect Ducting. Follow PlumbersStock on Facebook. Another important aspect is a standard safety factor is applied during testing. UL mandates damper samples test at airflow conditions that are at least fpm and 0.
This safety factor ensures dampers perform as intended under the rated airflow conditions when installing in the field. More information on fire damper installation and options will appear in a coming post. Be sure to watch for it. Until then, you can find out more about the various fire damper types here. Enter your first name. Enter your last name.
Enter your email address. Comments required. Enter email address. Glad You've Joined Us! We've sent a welcome message to the mail you provided, so be sure to check your inbox. Toggle navigation Toggle navigation. Language: English. Resources Blog. Topic: Dampers. Fire Dampers — Types, Testing, and Ratings. Fire dampers play a very important role in protecting buildings and saving lives in the event of a fire. Building codes require fire dampers to maintain the fire-resistance ratings of walls, partitions, and floors when penetrated by air ducts and transfer openings.
Special latches lock the blade in position. These latches keep the damper closed during a fire event. All fire dampers will be rated for static or dynamic air conditions depending on their design. This refers to whether the damper can close against air flow. A dynamic fire damper can close on an air stream even if fans are running dynamic air conditions. A static fire damper will only close if air flow has stopped static air conditions.
Choosing one over the other will depend on your fans. If your fans will stop at the start of a fire, then static fire dampers will work for your system.
If fans stay powered, you will need to use dynamic fire dampers. Fire dampers are can be rated for either static or dynamic conditions, but smoke dampers and combination fire-smoke dampers will only be rated for dynamic conditions. Noxious fumes can spread through your building by infiltrating the ventilation openings in yours walls and ceiling.
Smoke dampers contain these fumes and prevent them from spreading through your HVAC system. Smoke dampers are multi-blade dampers that are similar in design to standard control dampers, but with a few key differences.
These dampers have seals on the edges of each blade and along the damper's jambs, to prevent smoke from passing through the closed damper. When smoke is detected, the actuator will receive an electrical signal to force the damper closed and prevent smoke from spreading further into the HVAC system. Every smoke damper undergoes a multitude of tests in accordance with UL S, including an air leakage test.
Test labs measure air passing through the closed damper at elevated temperatures and across multiple sizes. The Leakage Class indicates the minimum amount of air allowed through the closed damper at a given air pressure:.
Leakage Class I is considered the best classification for smoke dampers because it allows for the least amount of leakage. Smoke dampers will typically remain closed when noxious fumes are detected in the air stream, but there are times when they may need to open again. First responders will need to access all areas of the building, including those areas filled with smoke and noxious fumes.
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