What is a magnetic door holder?
A magnetic door holder is a hardware fixture which uses a magnet to hold a door open or closed. Magnetic door holders can be valuable for safety because they can ensure that doors will stay open in an emergency.
Why are some fire doors held open by automatic devices?
A hold-open device is a mechanism that enables fire doors to be held open safely and is commonly used to help deal with issues of fire door wedging or improving accessibility. A trigger mechanism that processes the signals issued by the fire alarm.
Do fire doors require smoke detectors?
NFPA 72 2013 SD Spacing Requirements: If the depth of the wall section above the door is greater than 24 inches (610 mm) on both sides, two ceiling mounted smoke detectors or two wall mounted smoke detectors shall be required. One on each side of the doorway. Fire Alarms Online note: Per Figure 17.7.
What should you never do to a fire door?
Top things you should not do with fire doors
- Never lock a fire door.
- Never leave a fire door wedged open.
- Never allow a fire door to be blocked.
- Enfield Doors.
What happens to a magnetic door lock when a fire occurs?
If there is a fire, then, the magnetism is turned off when the fire alarm control relay turns off the power. A magnetic door lock keeps the door open so people can go through the door at all times.
Why do fire doors have electromagnets on them?
Their purpose is to both stop the spread of smoke, and slow the progress of fire. They are installed on fire walls, both the walls and the doors have an hour rating of how long they withstand fire under certain conditions. The reason they have the electromagnets is so that the fire alarm releases them and they close on alarm.
Why do fire doors close automatically when the alarm sounds?
They are designed this way. When the fire panel activates and alarm sounds, all fire doors being magnetically held open are released so that they close, therefore creating barriers to slow/stop the progress of any fire. 8 clever moves when you have $1,000 in the bank.
What happens to a fire alarm when the power goes out?
In a fire alarm system, though, the door holder has to allow the door to close even when there is a power blackout for the neighborhood. If there is a fire or smoke, then, the magnetism is turned off when the fire alarm control relay turns off the power.