Types of Ducting Explained: Flexible, Rigid, Spiral and Rectangular
Choosing the right ducting is essential for achieving efficient airflow, maintaining air quality and ensuring long-term system performance. Different ducting types are designed to suit specific applications, environments and installation requirements.
In this guide, we break down the key differences between flexible ducting, rigid ducting, rectangular ducting and spiral ducting, helping you understand where each option performs best.
What is Flexible Ducting?
Flexible ducting is designed for adaptability. Manufactured from materials such as aluminium or PVC, it features a bendable structure that allows it to navigate tight spaces and complex layouts.
This type of ducting is commonly used for short runs, connecting equipment or bridging gaps between rigid duct sections. It is particularly useful in retrofit projects, temporary installations or areas where access is limited.
While flexible ductwork is quick to install and highly versatile, it does create more internal resistance compared to rigid alternatives. For this reason, it is best suited to shorter distances where airflow efficiency is not the primary concern.
What is Rigid Ducting?
Rigid ducting is a fixed, solid solution typically manufactured from galvanised steel or other durable materials. It is widely used in commercial and industrial environments where consistent airflow and system longevity are critical.
With smooth internal surfaces, rigid ducting reduces air resistance and supports efficient airflow over longer distances. It is ideal for extraction systems, HVAC installations and high-volume ventilation setups.
Although installation can be more complex than flexible ducting, rigid systems provide superior performance, structural integrity and long-term reliability.
What is Rectangular Ducting?
Rectangular ducting is commonly used where space constraints prevent the use of circular systems. Its flat-sided design allows it to fit within ceilings, walls or tight service voids without compromising available space.
While rectangular ductwork can be highly effective, it typically produces more airflow resistance than circular alternatives due to increased surface area and internal friction. As a result, careful design and sizing are important to maintain system efficiency.
This type of ducting is frequently used in commercial buildings, offices and environments where space optimisation is a priority.
At AMS Ducting Supplies we design and manufacture custom rectangular ducting suited to your requirements. From straight lengths and reducers to 90 degree and 45 degree bends, get in touch with our team for expert ducting solutions.
What is Spiral Ducting?
Spiral ducting is a type of rigid ducting formed by shaping metal into a continuous spiral seam. It combines strength with improved airflow characteristics, making it a popular choice in modern ventilation systems.
The cylindrical shape of spiral ductwork allows air to move more efficiently, reducing pressure loss and energy consumption. It also offers excellent durability and a clean, uniform appearance, which is often preferred in exposed installations such as warehouses, retail units and commercial buildings.
Spiral ducting is well suited to both supply and extraction systems where performance and aesthetics are equally important.
Choosing the Right Type of Ducting
Each ducting type offers specific advantages depending on the application. Flexible ducting provides convenience and adaptability, while rigid and spiral ducting deliver performance and durability. Rectangular ducting is often the ideal choice for modern building designs looking to maximise space efficiency.
Selecting the correct ducting system ensures optimal airflow, improved energy efficiency and long-term reliability. By understanding the strengths of each option, you can design a system that meets both operational and environmental requirements.
How AMS Ducting Supplies Can Help
At AMS Ducting Supplies, we have supplied ducting supplies to a range of industries for nearly 30 years. Located in the heart of the Midlands, we design, manufacture and supply various types of ducting to ensure your property has sufficient and effective ventilation.
Browse our range of products or contact our team today to find out more.
