Circular Duct Systems

Round Ducting Systems for Efficient Ventilation and Mould Control

Looking for a cost-effective way to improve airflow and heat retention in your home or building project? Blauberg’s circular ducting range is designed to maximise ventilation performance, reduce energy loss, and help tackle mould — all while supporting compliance with modern building standards like Part F and Awaab’s Law.

Whether you're fitting a bathroom extractor fan or installing an alternate flow heat recovery fan, our round ducting solutions give you the edge in efficiency and reliability. Ideal for social housing, rental properties, and homeowner upgrades.

What Is Circular Ducting?

Circular ducting — also called round ducting or duct tube — is a rigid pipe used to transport air within mechanical ventilation systems. Unlike flat or flexible alternatives, circular ducting offers smoother internal airflow, reducing turbulence and resistance.

These ducting pipes are most commonly used with extractor fans, MVHR systems, and alternate flow heat recovery fans. By maintaining a continuous downward slope during installation, the system efficiently drains condensation while preserving thermal energy — making it an excellent choice for energy-conscious ventilation design.

Key Benefits of Round Ducting

• Improved airflow efficiency compared to rectangular ductwork
• Low pressure drop — great for low-energy and continuous ventilation systems
• Minimises condensation and mould by maintaining proper duct slope
• Compatible with a wide range of extractor fans and ventilation units
• Ideal for both supply and exhaust air applications
• Quick to install with minimal disruption

A Better Way to Solve Mould — For Less

Round ducting works seamlessly with alternate flow heat recovery fans — a powerful way to reduce heating bills and improve air quality. Unlike standard extractor fans that throw away warm air, heat recovery fans capture that warmth and transfer it to incoming fresh air.

When paired with Blauberg circular duct systems, this setup becomes even more efficient, helping landlords, local authorities, and private homeowners protect their properties from mould at a lower cost.

Where to Use Circular Ducting?

These duct tubes are suited to all property types and ventilation setups:

• Bathroom, kitchen, and utility room extraction
• Whole-house MVHR and MEV systems
• Retrofitting older properties prone to damp
• Energy-efficient new builds needing precise airflow
• Social housing requiring compliance with Awaab’s Law and PAS 2035

Available Sizes and Options

Our ducting pipe range includes diameters of 100mm, 125mm, 150mm, and 200mm, giving you flexibility across all project scales. We also stock accessories such as:

• Reducers and adaptors for mixed-size systems
• 90° and 45° elbows for changes in duct direction
• Backdraft dampers to prevent cold air ingress
• Wall and ceiling mounting brackets

For moisture management, we recommend maintaining a 3% downward slope on horizontal runs — particularly when paired with heat recovery systems — to direct condensation outwards and prevent pooling.

Built to Last. Easy to Fit.

Blauberg circular ducting is made from high-quality PVC or metal with excellent resistance to pressure, temperature, and humidity. Its rigid structure means you can cut and seal sections easily without worrying about kinks, bends, or leaks common with flexible ducting.

Installers benefit from the standardised sizing and tool-free accessory fitments. Once installed, the ducts support long-term performance with minimal maintenance — ideal for high-traffic applications such as rental units, housing association properties, and commercial buildings.

Maximise Energy Savings with Round Ducting

When installed as part of a balanced ventilation system, circular ducts reduce resistance, lower fan workload, and keep air moving efficiently. This results in quieter operation, fewer call-backs, and reduced electricity usage — supporting wider net-zero goals across domestic and commercial properties.

For projects focused on air tightness and EPC ratings, this type of ducting pipe is an easy win.