Round Manual Air Volume Damper

Round Manual Air Volume Damper — External Knob Stepless Regulation

A manual volume damper for circular ducts with an external control knob. Turning the knob moves the blade steplessly from fully open to fully closed, so installers and facility staff can trim branch airflow without tools. The PP body is light, corrosion-free and safe to handle.

Key Features

• External knob adjustment — regulate airflow without entering the duct
• Stepless travel — infinite positions between fully open and fully closed
• PP construction — light, chemical-resistant and corrosion-free
• Simple commissioning — balance each branch quickly after start-up
• Low cost, low maintenance — no actuator, no wiring, no power

Technical Specifications

Typical Applications

• Branch balancing in residential and light commercial fresh air systems
• Adjusting individual room supply where no automation is required
• Budget projects that still need proper airflow commissioning

System Matching

Fits our HDPE fresh air corrugated pipe and flexible aluminium duct. Where automatic control is needed, choose the electric on/off volume damper.

FAQ

Q: Will the setting hold?
A: The knob provides enough friction to hold position in normal operation; please confirm locking requirements with our sales team for critical applications.

Q: Is it suitable for both supply and exhaust?
A: Yes, it is bidirectional.

Q: What diameters are available?
A: See the specification table below for the standard range.