Is the fire door normally open or normally closed?

Question 1: What is the difference between normally open and normally closed fire doors? There are many kinds of fire doors, which can be divided into different types according to different situations. And there will be many differences between each type of fire door. For example, there are many differences between normally open fire doors and normally closed fire doors according to different opening methods. Normally closed fire doors are normally closed. It is necessary to push the door open when people are walking around. However, the normally closed fire door has some shortcomings in this open state: because the fire door is usually installed in the passage where people often walk, the normally closed fire door is usually in the closed state, which causes certain contradictions. Especially in large shopping malls, the flow of people is large. If normally closed fire doors are installed in the internal evacuation stairwell, the fire doors will be damaged and fall off due to frequent opening and closing, which will not play a fire prevention role and form a fire hazard. On the contrary, normally open fire doors are usually open and will automatically close in case of fire. Because it is kept open at ordinary times, it is convenient for people to pass, ventilate and light, and it can be automatically closed in case of fire, which plays the role of smoke prevention and fire prevention. Therefore, it completely solves the inconvenience caused by the normal closing of the fire door to the passage of people and the man-made damage caused by the frequent opening and closing of the fire door, and ensures the fire safety at the same time. Therefore, normally open fire doors should be set in the evacuation stairwells of some large shopping malls, which are usually open. In case of fire, the door closer is controlled by various sensors.

Question 2: What is the difference between a normally open fire door and a normally closed fire door? Introduce normally open fire doors;

Fire doors arranged on the evacuation passage;

Fire doors leading from an independent fire zone to another fire zone in the building;

An open door on a firewall;

Crowded places in high-rise public buildings, such as shopping malls, hotels, schools, teaching buildings and apartment buildings;

Fire elevators in these buildings are generally shared with passenger elevators, and the front room of the elevator and the smoke-proof stairwell share the front room. The fire door at the joint between the shared front room and the evacuation passage shall be a standard normally open door.

The normally closed fire door is introduced.

In order to prevent smoke or fire from escaping into the evacuation passage and stairwell through the doorway in case of fire, and ensure the relative safety of the evacuation passage and the safe evacuation of personnel, the fire doors in these parts should be closed at ordinary times, and can be closed automatically after evacuation in case of fire.

Normally closed fire doors should be set in the following places and parts: fire doors in high-rise residential buildings, pipeline wells attached to buildings, fire control rooms, fire pump rooms and other equipment rooms. The flow of people and materials in these buildings and parts is relatively fixed at ordinary times, which can ensure the "closed" function of normally closed fire doors in actual use.

Control methods of normally closed fire doors and normally open fire doors.

Normally closed fire doors are generally composed of fire doors, door frames, door closers and sealing strips. Two or more normally closed fire doors are also equipped with sequencers. Normally closed fire doors do not need electrical automatic control, and are mainly closed by door closers and sequencers.

Normally open fire doors are generally composed of door leaves, door frames, door closers, sealing strips, release switches and other components. The automatic control principle is that the normally open fire door is controlled by the fire door release switch, which is usually installed on the wall or self-made bracket, and the height is about 1. 4 meters above the ground. Usually, the control module of the fire control center or FMK controller outputs DC24V working voltage to the electromagnetic door bolt to keep the fire door open. In case of fire, the smoke detector or the temperature detector will transmit the detected signal to the control switch, and the DC24V will be powered off, so that the electromagnetic door bolt will be powered off and the rear door body will be released. The door closer will close the fire doors, and close the double fire doors in turn by controlling the delay and power failure of the left and right doors, and feedback the closing signal at the same time. Normally open fire doors must be reset by field manpower, and the status signal of the fire doors after reset will be fed back to the fire control room.

For more information on fire prevention, please search: Ma Bei Fire Door.

Question 3: Do fire doors have to be normally closed? The instructions explain, thank you. It depends on the location of the fire door. Normally closed fire doors are one of the classification methods of fire doors, such as pipes (wells, electric wells, etc.). ), and the corresponding normally open fire door passes through it. This is just the classification according to the state of the switch, just like the classification of wood and steel according to the material. Gb 12955-2008 requires that fire doors should be equipped with fire door closers or closing devices that allow normally open fire doors to automatically close their doors in case of fire (except for special parts, such as pipeline manhole doors). That is to say, except for some special parts, such as pipeline well doors, fire door closers need to be installed in other parts. I hope I can help you.

Question 4: What's the difference between normally open fire doors and normally closed fire doors? The function of fire door is the last protective barrier of life and property. It is particularly important to choose normally open and normally closed fire doors according to the flow of people in the place. Improper selection will cause economic losses and life risks due to fire accidents, which can not be ignored. So, what's the difference between normally open and normally closed fire doors? Ma Bei Fire Door I Amin Xu share here:

What is the difference? To understand the difference between the two, we must first figure out how normally open fire doors and normally closed fire doors play a fire prevention role.

Normally open fire doors 1, generally installed in places with large traffic, such as schools, large shopping malls, hospitals and other places, should be open under normal circumstances to facilitate people's access;

2. It is definitely inconvenient to install normally closed fire doors. Frequent opening and closing will lead to the damage of normally closed fire doors, which will not play a fire prevention role and form a fire hazard. Therefore, normally open fire doors are generally installed in these places;

3. When a fire occurs, the fire door monitor sends out an alarm signal, and the electric door closer automatically closes the fire door.

The function of the electric door closer is to automatically close the normally open fire door after receiving the signal, and the signal should be fed back to the fire door monitor to tell the fire door monitor that the door has been closed. The fire door monitor will not give an alarm after receiving the feedback signal. In this way, when a fire occurs, the normally open fire door is closed under the action of the fire door monitoring system, which plays a role in smoke and fire prevention.

Normally closed fire doors 1 are generally installed in places with few people, and should be closed under normal circumstances and in case of fire. People need to push them away when walking, thus playing the role of smoke prevention and fire prevention, and preventing the fire from spreading.

2. Some people say that since they are all closed, is it necessary to install a fire door monitoring system? The answer is that it still needs to be installed. Because normally closed fire doors cannot be guaranteed to be closed forever. At present, there are many fire accidents. In many cases, the normally closed fire doors are artificially opened, such as using fire extinguishers or bicycles to keep them open.

Once the normally closed fire door is opened for a long time, when a fire breaks out, it will easily spread to the fire exits such as stairwells, and it will not play a fire prevention role.

3. The door magnetic switch of the fire door is actually a signal to detect the normally closed state. Therefore, when someone opens the normally closed fire door for too long, the door magnetic switch will send a signal to the fire door monitor, and the fire door monitor will send an alarm to remind people to deal with it.

Finally, to sum up, normally open fire doors and normally closed fire doors need to be selected according to different settings, and whether they are normally open fire doors or normally closed fire doors, fire door monitoring system is essential, which can realize centralized management and control of fire doors in buildings and eliminate potential safety hazards caused by improper use of fire doors.

Question 5: Why should the fire door of the fire escape be kept normally closed? Fire door is the last protective barrier of life and property. It is particularly important to choose normally open and normally closed fire doors according to the flow of people in the place. Improper selection will cause economic losses and life risks due to fire accidents, which can not be ignored. Then, why is the fire door of the fire escape kept normally closed? My Amin Xu shared Ma Bei fire doors as follows:

Automatic fire exits with few people should be closed under normal circumstances and in case of fire, and people need to push them away when walking, thus playing the role of smoke prevention and fire prevention and preventing the spread of fire.

It's very safe to drive often. Once the normally closed fire door is opened for a long time, when a fire breaks out, the fire will easily spread to the fire exits such as stairwells, and it will not play a role in fire prevention. What's worse is to lock the fire door so that people can't escape through it.

The monitor automatically alarms the magnetic switch of the fire door, which is actually a signal to detect the normally closed state. Therefore, when someone opens the normally closed fire door for too long, the door magnetic switch will send a signal to the fire door monitor, and the fire door monitor will send an alarm to remind people to deal with it.

Precautions Some people say that since they are all closed, is it necessary to install a fire door monitoring system? The answer is that it still needs to be installed. Because normally closed fire doors cannot be guaranteed to be closed forever. At present, there are many fire accidents. In many cases, the normally closed fire doors are artificially opened, such as using fire extinguishers or bicycles to keep them open.

Simply put, if it is always open, when there is an emergency fire, no one closes the fire door, and the fire can easily spread to fire exits such as stairwells, resulting in

Loss of life and property.

Question 6: Is the hotel fire door normally open or normally closed? Fire doors arranged on the evacuation passage; Fire doors leading from an independent fire zone to another fire zone in the building; An open door on a firewall; ? Crowded places in high-rise public buildings, such as shopping malls, hotels, schools, teaching buildings and apartment buildings; Fire elevators in these buildings are generally shared with passenger elevators, and the front room of the elevator and the smoke-proof stairwell share the front room. The fire door at the joint between the shared front room and the evacuation passage shall be a standard normally open door. Brief introduction of normally closed fire doors: In order to prevent smoke or fire from escaping into the evacuation passage and stairwell through the doorway in case of fire, and ensure the relative safety of the evacuation passage and the safe evacuation of personnel, the fire doors in these parts should be closed at ordinary times and can be closed automatically after evacuation in case of fire. Normally closed fire doors should be set in the following places and parts: fire doors in high-rise residential buildings, pipeline wells attached to buildings, fire control rooms, fire pump rooms and other equipment rooms. The flow of people and materials in these buildings and parts is relatively fixed at ordinary times, which can ensure the "closed" function of normally closed fire doors in actual use. ? Control methods of normally closed fire doors and normally open fire doors. ? Normally closed fire doors are generally composed of fire doors, door frames, door closers and sealing strips. Two or more normally closed fire doors are also equipped with sequencers. Normally closed fire doors do not need electrical automatic control, and are mainly closed by door closers and sequencers. Normally open fire doors are generally composed of door leaves, door frames, door closers, sealing strips, release switches and other components. The automatic control principle is that the normally open fire door is controlled by the fire door release switch, which is usually installed on the wall or self-made bracket, and the height from the ground is about I.4m. Usually, the control module of the fire control center or FMK controller outputs DC 24V working voltage to the electromagnetic door bolt to keep the fire door open. When there is a fire, the smoke detector or the temperature detector will transmit the detected signal to the control switch, and the DC 24 V will be cut off, so that the rear door body will be released when the electromagnetic door bolt is cut off. The door closer will close the fire doors, and close the double fire doors in turn by controlling the delay and power failure of the left and right doors, and feed back the closing signal at the same time. Normally open fire doors must be reset by field manpower, and the status signal of the fire doors after reset will be fed back to the fire control room. For more information on fire protection, please search: Ma Bei Fire Protection.

Question 7: Should the fire doors in the corridors of residential buildings be kept open or closed at ordinary times? 1. Normally, this kind of door should be closed (be careful not to lock it). 2. High-rise buildings adopt smoke-proof stairwells with two doors, both of which are Class B fire doors. The normally closed reason is that when a fire breaks out on a certain floor, smoke will not spread to the stairwell through this door. In this case, the stairwell is smoke-free and safe, and people can escape from it. 3. This normally closed fire door has a door closer (and a sequencer if there are two doors), which will automatically close after being pushed open. 4. There is also a kind of fire door that may be always open (for example, in some hospitals, because they often take the stairs, if they push the door every day, the door closers will easily break down). The normally open fire door has an automatic control device, which will automatically close in case of fire. 5. These requirements are all technical requirements for fire control, not stipulated by any law. However, if the fire door cannot be kept closed, the unit can be punished according to the Fire Protection Law.

Question 8: How to distinguish between normally open fire doors and normally closed fire doors on drawings? Normally closed fire doors are independent and have no connecting wires. Look at the electrical drawings. If the door has wires and modules, it is a normally open fire door.

Question 9: What are the control methods for normally opening fire doors? There are three control devices for normally open fire doors:

1, electromagnetic release: Also known as manual release, the release is manually inserted into the electromagnetic release when the door is opened, and the fire door is automatically closed under the action of hydraulic door closers. It will not reset automatically when it is used again, and it needs to be reset manually. Because it has many internal mechanical structures, such as paddles, connecting rods, locks and so on. It is easy to be deformed or blocked, and quality problems often occur. The power supply and door closing do not meet the fire protection specifications, so it is not accepted by the market.

2. Electromagnetic door bolt releaser: also called automatic releaser, the electromagnetic door bolt automatically sucks the door for positioning when pushing the door, without manual operation, releases the door when power is off in case of fire, and automatically closes the fire door under the action of hydraulic door closer. This product meets the fire protection requirements of "power failure and door closing", and has the characteristics of advanced design, convenient installation, reliable use and low power consumption, and is widely used in fire doors on fire evacuation passages in buildings.

3. Electric door closer: It is an electromagnetic trip door closer, which is different from the hydraulic fire door closer. Inside is equipped with solenoid valve and powerful spring. When the door is pushed, the spring is compressed and locked by the solenoid valve. When power is sent, the release of the solenoid valve is closed due to the rebound impact of the spring. It has no buffering function and cannot adjust the speed. It will rebound after hitting the door, so it can't be called a door closer.

Question 10: Normally closed fire doors Normally closed fire doors are one of the classification methods of fire doors, such as pipes (water wells, electric wells, etc.). ), and the corresponding normally open fire doors and access doors. This is only classified according to the state of the switch, just as it is made of wood according to the material.

Generally, fire doors are normally closed, and normally open fire doors are rarely used. Generally, the doors in the passage and the equipment room are also normally closed, which is what we usually see. Normally open refers to the fire doors that often leave people, and should be designed as normally open, which is included in the fire protection design of buildings.