Opening size and sheet thickness
The larger listed openings use a thicker sheet construction. Choose the opening to match the connected duct and airflow duty, while allowing space to reach the handwheel.
PRODUCT / TECHNICAL DATA Cleanroom Ductwork & AccessoriesSpecifications / Configurations / Procurement
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Cleanroom Ductwork & Accessories
Manual Volume Control Damper
Product specifications
| Brand | ST |
|---|---|
| Product type | Manual volume control damper with integral flanges |
| Operation | Handwheel-operated blade adjustment |
| Blade arrangement | Linked multiple blades |
| Duct shape | Rectangular; listed standard openings are square |
| Material options | Galvanized steel or stainless steel |
| Connections | Integral duct flanges with fixing holes |
| Surface finish | Smooth, burr-free edges |
| Uses | Ventilation, exhaust and dust-extraction airflow adjustment |
| Customisation | Non-standard dimensions and material options |
Customization availableSpecifications can be customized to your requirements.
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Specify the quantity and configuration in your inquiry.
Manual Volume Control Damper balances airflow between rectangular ventilation or extraction branches. Turning the handwheel moves the linked blades, changing branch resistance so measured airflow can be adjusted where rooms or extraction points have different demands.
Local mechanical adjustment suits systems set during commissioning and readjusted when required. Integral flanges connect the frame to the duct without adding actuator wiring.
MODELS AND DIMENSIONS
Galvanized steel size options
| Opening size (mm) | Listed sheet thickness (mm) |
|---|---|
| 100 × 100 | 1.2 |
| 150 × 150 | 1.2 |
| 200 × 200 | 1.2 |
| 250 × 250 | 1.2 |
| 300 × 300 | 1.2 |
| 350 × 350 | 1.2 |
| 400 × 400 | 1.2 |
| 450 × 450 | 1.2 |
| 500 × 500 | 1.2 |
| 600 × 600 | 1.5 |
| 700 × 700 | 1.5 |
| 800 × 800 | 1.5 |
| 900 × 900 | 1.5 |
Non-standard sizes and stainless steel versions can be customised.
MODEL DIFFERENCES
Which configuration fits the task
MANUAL FLOW ADJUSTMENT
Set the blade opening to suit the branch
Linked blade movement
One handwheel moves the blade assembly, so the opening can be adjusted across the duct section.
No electrical control connection
Local mechanical adjustment avoids an actuator power supply and control wiring where settings only need occasional changes.
Integral flanged frame
The flanges and fixing holes provide a direct connection to matching ductwork; smooth edges make handling and assembly easier.
APPLICATION ENVIRONMENTS
Where manual airflow balancing is useful
Commercial building ventilation
Balance supply or extract branches serving offices, shops and other occupied areas so airflow can be adjusted to each area's requirement.
Workshop exhaust systems
Adjust individual extraction branches when several work areas share a fan and duct network.
Dust-extraction ductwork
Set airflow in branches leading to a dust collector to suit the extraction demand at their pickup points.
INSTALLATION AND ADJUSTMENT
Keep the handwheel accessible for balancing
Allow access to the operator
Leave space to turn the handwheel; provide an access opening when the damper is installed above an enclosed ceiling.
Set against measured airflow
During commissioning, adjust the blade position using airflow measurements and recheck the balance after changes to the duct system.
Match the duct connection
Select the opening size, material and flange arrangement to match the adjoining duct sections.
PROCUREMENT / INQUIRY
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