Square Manual Volume Control Damper
Rectangular manual volume control damper, also known as manual air balancing damper, is a mechanical airflow regulator for HVAC rectangular duct systems. Featuring optional opposed blade and parallel blade structures plus external manual operating levers, this duct damper allows flexible airflow adjustment for system commissioning and daily air volume balance. Constructed from multiple metal material options with optional low-leakage sealing design, it boasts long service life and simple installation. Suitable for commercial buildings, industrial ventilation, air handling unit supply and return ducts, it is a standard adjustable air control accessory widely supplied by HVAC component manufacturers.
Product Description
The Manual Volume Control Damper (VCD) is designed to regulate and balance airflow within rectangular HVAC duct systems. Installed inside air ducts, this damper allows precise adjustment of supply or return air volume to improve airflow distribution, system efficiency, and indoor comfort.
This type of damper is widely used in commercial and industrial ventilation systems for air balancing during installation, commissioning, and routine operation. It can be manufactured in opposed blade or parallel blade configurations depending on the project requirement. Manual operation is typically achieved by a quadrant handle or hand lever mounted on the damper shaft, allowing convenient on-site airflow adjustment.
Constructed from galvanized steel, aluminum, or stainless steel, the damper offers reliable durability, corrosion resistance, and long service life. Optional sealing designs are also available for improved air tightness and lower leakage performance.
Key Features
- Accurate Airflow Regulation Enables precise adjustment of supply or return air volume
- Manual ControlOperated by quadrant handle or hand lever for easy field adjustment
- Multiple Blade ConfigurationsAvailable in opposed blade or parallel blade design
- Durable ConstructionManufactured from galvanized steel, aluminum, or stainless steel
- Low Leakage OptionOptional gasket or seal for improved airtightness
- Wide Application RangeSuitable for commercial, industrial, and general HVAC systems
- Customizable DimensionsStandard and custom sizes available
- Easy InstallationDesigned for integration into rectangular ductwork
Applications
- HVAC air distribution systems
- Commercial buildings
- Office buildings, hospitals, hotels, and shopping malls
- Industrial ventilation and exhaust systems
- Air balancing during system commissioning
- AHU duct connections
- Supply air and return air duct systems
- Ventilation control in rectangular ducts
Technical Specifications
| Parameter | Value / Option |
| Product Name | Manual Volume Control Damper |
| Type | Manual Air Volume Damper |
| Shape | Square / Rectangular |
| Blade Type | Opposed Blade / Parallel Blade optional |
| Material | Galvanized Steel / Aluminum / Stainless Steel |
| Frame Thickness | 0.8 mm – 2.0 mm |
| Control Type | Manual quadrant handle / hand lever |
| Operation | Manual adjustment |
| Sealing | Optional gasket / low leakage design |
| Size Range | Standard sizes and custom sizes available |
| Operating Temperature | Standard HVAC range / customizable |
| Installation | Rectangular duct connection |
| Application | HVAC / Ventilation / Air balancing |
| OEM / ODM | Available |
