Fire Door Closer Fusible Link

Fusible link arms closer are not recommended to be used as a fire life safety device in occupied areas. A fusible link is heat activated meaning it must be exposed to fire before it can melt and release the fire door to close. In the days before hold open devices on fire doors and smoke doors were actuated by smoke detectors fusible link closer arms were often used to hold open doors that were required to close if a fire occurred.

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The fusible link is one of the simplest forms of heat detection devices.

Fire door closer fusible link.

Fusible link door closers and arms. The fusible link will separate at 165 degrees and will release the tension of the door to automatically close in a case of a fire. If you have a building were you have a high traffic and abusive especially exterior doors then this is the closer. When links are used in a restaurant system their purpose is to cause the system to function and extinguish the fire.

Install with s hooks or chain not included. High temperatures melt the solder bond between links causing them to separate and release their load. The ul listing number is for the fusible link arms is r1943. Lcn 4110 fusible link door closer 385 00.

The 4010 series can be templated for 100 or 140. Fusible links automatically close fire doors windows lids dampers vents and more in the event of a fire. 4020fl add to cart add to compare lcn 4010 fusible link door closer. 4110fl add to cart add to compare lcn 4020 fusible link door closer 385 00.

Fusible links used in this manner are actually releasing devices that are heat actuated. High temperatures melt the solder bond between links causing them to separate and release their load. The fusible link is a lead clip that melts at roughly 115 degrees and releases the door so it can close and contain a fire. It controls the rate of door descent.

Lcn door closer fusible links. The 4110 and the 4020 series can be templated for 100 140 or 180. This helps prevent the spread of flame but a fusible link will not help to slow the spread of smoke. All of our fire doors are equipped with a speed governor or a viscous wheel governor which will help the door drop at a descent speed and not let the door crash down.

At this point lcn is one of the only companies still making this type of door closer. Install with s hooks or chain not included. The fusible link door closers were used from the 1940 s to now but have seen their usage declining due to the modern fire alarm systems that are wired into door closers. Fusible links automatically close fire doors windows lids dampers vents and more in the event of a fire.