(I) fire damper, smoke exhaust fire damper concept.
Fire damper is installed in the ventilation, air conditioning system to send, return air pipe road, usually open state, fire when the gas temperature in the pipe reaches 70oC automatically shut down, in a certain period of time to meet the fire stability and fire integrity requirements, the role of smoke fire valve.
Smoke fire damper is installed in the exhaust system pipe, usually open state, fire when the gas temperature in the pipeline reaches 280 ℃ automatically closed, in a certain period of time to meet the fire stability and fire integrity requirements, the role of smoke fire retardant valve.

(II) the role of fire dampers.
A complicated air supply and smoke exhaust system has complicated pipelines. In the air supply system, the air sent by the blower must be distributed to each branch pipe through the main pipe. In the exhaust or smoke exhaust system, the air or smoke is collected from each branch pipe to the main pipe and then enters the exhaust fan for exhaust. Then, no matter in the fire valve system of the air supply system or the smoke exhaust system, if there is no obstruction, the air supply volume and smoke exhaust volume cannot be controlled, there is a lot of air supply and smoke exhaust in the parts that do not need air supply or smoke exhaust, while the parts that need air supply or smoke exhaust do not send air, smoke exhaust or only a small amount of air supply and smoke exhaust. In order to cut off the pipeline of the smoke exhaust part without air supply or smoke exhaust, this requires a valve device.
In addition, although the air volume of each part of the air supply and exhaust system is calculated through the pipeline and the corresponding pipeline design, on the one hand, there is a certain deviation between the theoretical calculation and the actual situation, on the other hand, the operating conditions of the system are constantly changing, so the air volume of each part of the system must be adjusted accordingly, which in turn requires valve devices.
In addition, some ventilation equipment, such as centrifugal fans, is best started with no load when starting, because the starting current of the motor is the smallest, which is beneficial to safety. This requires cutting off the system pipeline before starting. When the inlet and outlet of the fan are equipped with a switch, the fire damper is usually closed at the inlet or outlet. If the inlet and outlet are not equipped with a switch, it must be controlled by a valve device.

(III) fire dampers and smoke exhaust fire dampers are arranged on the pipes of ventilation and air conditioning systems, and smoke exhaust fire dampers are arranged on the pipes of smoke exhaust systems to prevent the transmission of high-temperature toxic smoke during fire, which will cause the spread of fire and aggravation of toxicity.
1. In one of the following situations, the air duct of the air conditioning system shall be equipped with fire dampers:(1) the pipe passes through the partition wall of the fire compartment,(2) the pipe passes through the ventilation, air conditioning room and the partition wall and floor of the important or high fire risk room,(3) the horizontal pipe section at the junction of the vertical air duct and each layer of horizontal air duct (4) the pipe passes through both sides of the deformation joint.
The fire valve in the above parts will automatically close when the temperature of the gas in the pipeline reaches 70oC in the fire.
2. Separation of smoke exhaust system:(1) At the population of the smoke exhaust room, the fire damper is equipped with a smoke exhaust fire damper that can be automatically closed when the smoke temperature exceeds 280oC. The smoke exhaust damper shall ensure that it can work continuously for 30min at 280oC. (2) A smoke exhaust fire damper that can be automatically closed when the smoke temperature exceeds 280C is set on the smoke exhaust branch pipe.

(IV) to carry out the significance of this study Fire dampers, smoke fire dampers as building fire prevention, smoke control system is an important part of its quality is directly related to the success or failure of the system set, the relationship between the building fire safety and evacuation safety.
Whether for suppliers, users, or fire supervision departments, are of great concern to its quality.
Smoke exhaust fire damper generally uses a single input module. Purpose: However, when the flue gas temperature is higher than 280 degrees, the fire damper is easy to melt metal and break, the fire damper is closed, and a closing signal, alarm and wiring are output to the module. The normally open terminal (short circuit when the fire damper is closed and short circuit when it is opened) is connected to the module.
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