What is air damper? What is that? Structure, Classification and Application in Ventilation System
In air conditioning and ventilation systems, Air Damper is an indispensable device to effectively regulate, control and distribute air flow. Although it is a small part, the air valve plays an extremely important role in maintaining pressure, flow and wind direction according to the system design.
So what is Air Damper , what types are there and what are the applications? Join Eusteel to find out details in the article below.
1. What is Air Damper ?
Air Damper is a device installed inside the air duct system or at the inlet and outlet location, with the function of regulating – blocking – redirecting airflow in the HVAC system (Heating, Ventilation, and Air Conditioning).
Air Damper helps control airflow in each area, adjusts air flow according to usage needs, and helps isolate areas in emergency situations such as fire and explosion.
2. Air Damper structure
A typical Air Damper includes:
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Valve body: Is the outer frame, usually made of galvanized steel, stainless steel or aluminum.
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Valve leaf (valve spoke): Metal blades that can rotate to open/close or adjust flow.
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Rotating shaft – lever: Helps control the opening angle of the valve (can be by hand or by motor).
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Included accessories: Rubber ring, latch lock, motor box (if automatic valve)…
3. Popular types of Air Damper
🔹 Air Damper lever (Volume Control Damper)
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Controlled by mechanical lever.
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Used to increase – decrease the amount of air circulating in each duct section.
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Suitable for civil systems, offices, small factories.
🔹 Non-Return Damper
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Only allow air flow in one direction.
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Prevents wind return, air escape or dirty air intrusion.
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Often used for exhaust systems.
🔹 Motorized damper
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Automatically opens and closes according to control signals from the BMS system or sensors.
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Suitable for smart buildings and automated factories.
🔹 Fire damper
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Automatically closes when a fire occurs, preventing smoke and fire from spreading through the duct system.
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Integrated with thermal activation mechanism or emergency closing motor.
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Required in HVAC systems of high-rise buildings, shopping malls, and hotels.
🔹 Square Air Damper – Round Air Damper
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Classified by duct cross section: installed on square or round ducts.
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Similar structure and function, just different shape.
4. Application of Air Damper
Air Damper is widely used in:
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Central air conditioning system (AHU, FCU)
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Ventilate basements, garages, and apartment hallways
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Manufacturing workshops, warehouses, clean rooms, processing plants
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Fire protection system – fire prevention
5. The important role of Air Damper in the HVAC system
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Adjust air flow according to each area
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Equalize pressure in the duct system
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Ensure fire safety
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Easy to maintain, disassemble, and replace locally when problems occur
6. Eusteel – A reputable supplier of Air Damper, accurate in every detail
At Eusteel, we specialize in providing high quality Air Damper with a variety of types: hand valves, electric valves, fireproof valves, one-way valves… that fully meet technical standards and project requirements.
