Common fire door closers types: Can't deny device of modern building
Description: Are you wondering what hardware you should fit to your emergency fire exit door lock? This is a common question. HeleH will help you to choose the best type of door closers for you!
Fire door lock requirements - the first step before install your door closers
To understand the basic requirements of a fire lock and door closers, you should understand the purpose. Essentially, a fire door has the capabilities of a regularly functioning door at all times. Indeed, this means that in some capacity it should have the ability to grant and restrict access. Moreover, a fire or any other applicable emergency that calls for a quick and expedient exit.
The fire door also has to be able to contain a fire within a given area and prevent it from spreading to other parts of a building. It itself does not only consist of the locking mechanism that bars or restrict access. However, it also consists of other components which are usually collectively classified as fire door closers.
Picture 1: Contact locksmith to have the suggestion about installing fire door closers
Every fire door should hung on hinges that are incorporated as a part of the fire door lock. However, one of the requirements for fire doors stipulates that door closers be steel bearing or heavy duty. The reason behind this is the fact that other materials are not able to withstand the pressure.
3 main types of fire door closers in locking market
Self-Closing fire door closers
According to NFPA 80 3.3.101 “Doors that, when opened and released, return to the closed position”!
In simpler terms, everytime you push to open, it will return to the closed position immediately via door closers arm. These doors continuously keep in the closed position except when someone is walking through the door.
Automatic closing door closers
Automatic door closers come with is a door that is normally held in the open position. However closes when the automatic-closing device is activated. The automatic-closing device causes the door and door closers to close when activated by a fusible link/ detector. Though NFPA does allow fusible links they are not the most effective and reliable method. As a result, it is to ensure your fire doors close in case of a fire.
Picture 2: Overhead door closers are very good for fire exit door
A fusible link is just very heat activating. This means it must be an exposed thing to fire before it can melt and release to close. Indeed, it helps prevent the spread of flame, but a fusible link won’t help to slow the spread of smoke. A smoke detector can sense smoke in the air. Of course, it sends a signal to close door by fire door closers before flames can reach the door.
Upon release of the hold-open mechanism, the leaf will become self-closing.
The release device is good enough so that the leaf instantly releases manually. As a result, upon release, it becomes self-closing, or the leaf can be readily closed.
The automatic releasing mechanism or medium works by the operation of approved smoke detectors. Locksmith installed in accordance with the requirements for smoke detectors for door closers release service in NFPA 72.
Upon loss of power to device, the hold-open mechanism releases and the door leaf becomes self-closing.
The release by means of smoke detection of one door leaf in a stair enclosure results in closing all stair.
Power-Operated Fire Door
According to NFPA 80 3.3.92, Power-Operated door closers are items that opened and closed electrically or pneumatically. Power operated fire doors shall be equipped with a releasing device that shall automatically disconnect the power operator of fire. This is always allowing a self-closing or automatic device to close the door. Of course, these door closers are regardless of power failure or manual operation. With NFPA 80 22.214.171.124 information.
Picture 3: Electromagnetic door closers in fire door is one of the best choice for modern buildings
This means, power-operated fire doors must be integrated with the fire alarm system of the building. This will allow the fire alarm to deactivate the open doors, and retract them into the closed position should there be an electrical or power failure.
The need for outward opening fire exit doors
Official guidance to the RRO recommends that that all doors on escape routes should open. Because in the direction of escape, this is particularly important if more than 60 people use them. On the other hand, they provide an exit from a high fire risk area.
Push bars and pads
Security fittings on fire doors should be as a hierarchy:
Nothing at all — the safest option;
Panic bar/ pad;
Emergency exit devices (the smaller pads and levers);
Turn knob, single bolt, or other simply operated, single device;
In buildings used by the general public, the usual hardware on final exits is a horizontal push pad or bar. Unless the door is completely free-moving, such as the front door once unlocked.
For this category of occupant, doors need to operate easily and obviously. If there are more than 60 persons, a degree of panic must be assumed. In this case, panic bars are essential. These door closers are long horizontal bars or pads which operate by body pressure. http://heleh.it/ This is the website that you can ask and have answer about locking furniture. Contact us today!