Fire Alarm Door Holder

In the event of a fire emergency the fire alarm control panel or other compatible control means will release the magnet allowing the door to close to prevent the spread of smoke. These door holder releases have a holding force of approximately 25 lbf 111n. An ordinary door closer and an electromagnet powered by the building s fire alarm and smoke detector system.

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These electromagnetic door holders will keep the door open.

Fire alarm door holder. A magnetic door holder is a relatively simple device that when powered typically by 24vdc or 120vac will create a magnetic pull. Under normal conditions the fire alarm control panel energizes the electromagnet and. For example the most common use is using the magnetic door holder as a hold open device. When de energized by a relay controlled by the fire alarm system or other switch the door is released to a closed position checking the spread of smoke and flames.

The device holds a door open while energized. That much is obvious. The door holder is an electromagnet a door holder prevents the door from closing because it hangs onto the door using magnetism. On commercial fire doors the magnetic fire door holders serves an array of purposes and safety functions.

Depending on your fire alarm installation you may need to install a magnetic door holder at the location of each fire door. Door holders are normally energized to magnetically hold doors open. In the event of a power failure they release the door to a closed position to keep the facility secure. The magnetic portion of this device is installed on the wall that meets the open fire door.

Since 1990 paladin protective systems and paladin professional sound have been a leading integrator in the cleveland and columbus areas offering professional installations in pro av pro audio access control cctv intrusion fire alarm and nurse call systems. When the fire alarm system detects smoke the current to the door holder turns off allowing the door to close. Doors may be manually closed or opened when the door holder is energized. Electromagnetic door holders and releasers keep doors open until they are released by fire alarm systems remote smoke detectors or other switching devices.

Making the magnetic field electrical current passes through the coil of the door holder. What i meant is that electrical contractors will power door holders separately and tie a 120 volt relay to the smokes which is ok but with the new techology on the current fire panels those relays are built into the panel and there is no reason to install a bunch of relays in the field if ul listed ones are built into the panel. They provide a high holding force. Hochiki s electromagnetic fire door holders are available in ground mount semi flush and surface mount and are also avialable in chrome and brass fisnishes.