Generally speaking, fire dampers are normally open valves that are settled in air conditioning systems or smoke control systems, air duct or flue.
1. In the air conditioning system, it is used in the air supply and exhaust pipelines. When the air pipes cross different fire prevention zones or cross through and arrive at important equipment rooms, after a fire breaks out, the 70-degree fuse or control module performs the "close" function to prevent the burned air from spreading along the air conditioning pipelines across the fire prevention zone.
2. In the smoke exhaust system, through the monitoring module or directly connected to the control cabinet of the smoke exhaust fan, when a fire breaks out and reaches 280 degrees in the flue, the smoke exhaust fan is actively turned off.
The so-called smoke exhaust fire damper has the functions of both smoke exhaust port and fire damper. It is a normally closed valve installed on the smoke exhaust duct. When a fire breaks out, the valve is "opened" through the control module to implement the smoke exhaust function. When the temperature in the smoke duct reaches 280 degrees, the fuse wire of the fire damper is actively fused, and a signal is given to close the corresponding smoke exhaust fan.
The difference between the two valves can be passed through the normal state of the valve: "normally open", "normally closed" and "fire smoke", "air conditioning ventilation" as well as the operating temperature "70 degrees", "280 degrees" difference.

Rules for setting smoke exhaust ports, smoke exhaust valves and smoke exhaust fire dampers in mechanical smoke exhaust systems of buildings.
1, smoke exhaust port or smoke exhaust valve should be set according to the smoke prevention zone, smoke exhaust port or smoke exhaust valve should be interlocked with the exhaust fan, when any smoke exhaust port or smoke exhaust valve is opened, the exhaust fan should be able to start by itself.
2. When the smoke exhaust port or smoke exhaust valve is usually closed, manual and automatic opening equipment should be set.
3. The smoke exhaust port shall be set on the ceiling or the wall surface close to the ceiling, and the small horizontal distance of the fire damper between the adjacent edge of the nearby safety exit along the walkway direction shall not be less than 1.5m. The distance between the smoke exhaust port on the ceiling and combustible components or combustibles shall not be less than 1.0m.
4. In the underground and semi-underground places where mechanical smoke exhaust system is set, except for the places where singing, dancing, entertainment, showing and the rooms with a construction area of more than 50 m ^ 2 ', smoke exhaust ports can be set in scattered walkways.
5. The horizontal distance between the smoke exhaust port in the smoke prevention zone and the farthest point should not exceed 300m, and the smoke exhaust branch pipe should be equipped with a smoke exhaust fire damper that can be closed by itself when the smoke temperature exceeds 280 ℃.
6. The wind speed of the smoke exhaust port should not be greater than 10 m/s.

At present, fire prevention and theft prevention is the priority of residents' life. Therefore, the application of smoke exhaust fire damper is becoming more and more common. However, there are many shortcomings and lack of fire damper in the detailed construction project. The following is a detailed analysis:
Disadvantage 1: The air inlet pipe and air outlet pipe of the fire control room are not equipped with fire dampers in the local black where they pass through the wall surface. In the construction review process, there are no fire dampers in the air supply pipe and air outlet pipe of the fire control room on some engineering planning manuscripts where they pass through the wall surface, which is contrary to some relevant regulations. The goal of setting fire prevention valve is to ensure the fire safety of the fire control room.
Disadvantage 2: The fire control is equipped with the control of smoke prevention and smoke emission equipment, and the display effect is incomplete. According to relevant regulations, in the future when the fire alarm is sounded, it is necessary to interrupt the air outlet of the air conditioner in some positions, cut off the electric fire prevention valve, and accept its feedback information, and at the same time open the smoke prevention and smoke emission fans and smoke exhaust valves in some positions.
Shandong Xingheng Environmental Technology Group Co., Ltd. is located in Luquantun Development Zone, Dezhou, Shandong Province, the hometown of glass fiber reinforced plastic in China. The company has three-level qualification for construction mechanical and electrical installation engineering, three-level qualification for environmental protection engineering, and safety production license. It is the first in the industry to pass ISO9001 quality management system certification, ISO14001 environmental management system certification, OHSAS18001 occupational health management system certification, an axial fan invention patent, a fan utility model patent, EIA, three at the same time waiting for complete procedures