Variable Air Volume Damper (VAV Damper)

Technical parameters of square variable air volume valve:

Technical parameters of circular variable air volume valve:

Why Choose a Variable Air Volume Damper?

In modern HVAC systems, supply, exhaust and outdoor airflow requirements vary with occupancy, operating conditions, temperature, humidity, air quality and process requirements. Operating at a fixed airflow continuously may result in unnecessary energy consumption, uneven airflow distribution or reduced indoor comfort.

With suitable controls, VAV dampers adjust airflow according to demand, supporting demand-based supply and exhaust ventilation. They can help improve ventilation system efficiency and support indoor air quality management in laboratories, hospitals, cleanrooms and commercial buildings.

Main Features

• Flexible Airflow Adjustment

  Adjusting the damper opening regulates airflow within the duct, supporting airflow adjustment and system balancing in supply, return, exhaust and outdoor air systems.

• Automatic Control Options

  Electric actuators, control modules and airflow sensors can be configured to suit project requirements. Automatic regulation, remote control and system integration depend on the selected components and control arrangement.

• Suitable for VAV Systems

  Suitable configurations can be used in VAV systems, laboratory exhaust systems, cleanroom supply and exhaust systems, and hospital ventilation systems to meet changing airflow requirements.

• Optional Control Methods

  Manual adjustment, electric on/off control and electric modulating control are available according to project requirements. Manual configurations allow the damper opening to be set on site. Electric on/off configurations open or close the damper, while electric modulating configurations adjust its position in response to a compatible control signal.

  Automatic regulation to an airflow setpoint requires suitable airflow sensors, controllers and actuators. Control signals, feedback functions and communication interfaces depend on the selected components and are confirmed during product selection.

• Supports System Balancing

  Adjusting airflow in individual branches helps reduce uneven airflow distribution and supports stable HVAC system operation.

• Robust Construction and Smooth Operation

  The damper body provides structural support, while the blade assembly allows smooth opening and closing. Actuator selection and operating frequency should be matched to the requirements of commercial, hospital, laboratory and industrial applications.

• Flexible Material Options

  Depending on the model and operating environment, material options may include galvanized steel, stainless steel, aluminum alloy and PP. Material selection should account for general ventilation, clean environments or corrosive exhaust applications.

• Convenient Installation and Maintenance

  Round and rectangular configurations are available to suit different duct systems, facilitating on-site installation, commissioning and routine maintenance.

Typical Applications

Depending on the body material and control configuration, VAV dampers can be used in:

• Commercial HVAC systems: Supply, return and outdoor airflow regulation in offices, hotels, shopping centers and similar buildings.

• Hospital ventilation systems: Supply and exhaust airflow regulation across different hospital areas, with control components selected according to project requirements.

• Laboratory exhaust systems: Airflow regulation for laboratories and fume hoods, with materials and controls selected according to exhaust characteristics and integration requirements.

• Cleanrooms and industrial ventilation: Supply and exhaust airflow regulation in pharmaceutical facilities, electronics manufacturing and industrial buildings. Room pressure control requires suitable sensors and a compatible control system.

Customization Capabilities

We support custom manufacturing according to project requirements, helping customers address different system designs and installation conditions.

Customization options and selection requirements include:

• Damper dimensions;

• Round or rectangular construction;

• Required minimum and maximum airflow (m³/h);

• Airflow range and control accuracy, confirmed according to the model, operating differential pressure and project requirements;

• Galvanized steel, stainless steel, aluminum alloy, PP or other specified materials;

• Manual, electric on/off or electric modulating control;

• Actuator brand and specifications;

• 0–10 V, 4–20 mA or other control interfaces, subject to component compatibility;

• Position, airflow or status feedback, depending on the selected configuration;

• Airflow sensors and control modules;

• Flanged, slip-in or other specified connections;

• Sealing, corrosion protection or thermal insulation arrangements;

• OEM/ODM manufacturing;

• Manufacturing based on drawings or samples.

For commercial HVAC, hospital, laboratory and industrial ventilation projects, we help customers define a suitable product configuration based on their requirements.

Our Advantages

• Engineering Selection Support

  We help customers select suitable body materials, actuators and control configurations based on minimum and maximum airflow, duct dimensions, operating pressure, environmental conditions and control requirements. For supply, exhaust and integrated control applications, project drawings and technical specifications help establish the selection criteria for installation, commissioning and equipment integration.

• Custom Manufacturing Based on Drawings

  We support customization of round and rectangular damper dimensions, connection methods, mounting arrangements and associated components according to customer drawings, equipment interfaces and site conditions. For new projects, customers can provide design drawings and equipment schedules. For renovation or replacement projects, existing dimensions, product photographs and installation requirements help confirm the configuration. Technical parameters, control interfaces and the scope of supply are confirmed before production.

• Pre-Delivery Inspection

  Products are inspected against the agreed drawings and configuration requirements, including dimensions, appearance, assembly and blade operation. For products equipped with electric actuators and control components, inspections cover actuator operation, control signals and applicable feedback functions as agreed. Inspection items and delivery requirements are defined according to the order configuration to support receiving inspection and on-site installation.

Request a Quote

If you are looking for a VAV damper or an HVAC airflow control damper, please contact us for a quotation.

To help us prepare a suitable proposal, please provide:

• Required damper dimensions;

• Duct shape, such as round or rectangular;

• Required minimum and maximum airflow (m³/h);

• System operating pressure range;

• Application, such as HVAC supply air, laboratory exhaust, cleanroom supply and exhaust, or hospital ventilation;

• Material requirements, such as galvanized steel, stainless steel, aluminum alloy or PP;

• Control method, such as manual, electric on/off or electric modulating control;

• Requirements for actuators, airflow sensors, signal feedback or remote control;

• Connection method, such as flanged or slip-in connections;

• Order quantity;

• Custom drawings or OEM requirements;

• Destination port or delivery location.

Based on your requirements, we will provide technical recommendations, a proposed product configuration and a quotation.