Aluminium Flexible Ducting — The Versatile Choice for Any Ventilation Project
Flexible ducting is one of those products that quietly underpin a wide range of ventilation systems — and aluminium flexible ducting is the format most installers and homeowners reach for first. It's lightweight, easy to cut, straightforward to connect, and handles heat and moisture without complaint. Whether you're routing through a tight ceiling void or connecting an extraction unit in a commercial kitchen, flexible aluminium ducting gets the job done with minimal fuss.
What Is Aluminium Flexible Ducting?
Aluminium flexible ducting is a corrugated ventilation pipe made from layers of aluminium foil wrapped around a spiral wire frame. The wire helix gives the duct its structure and allows it to flex freely — bending around obstacles, threading through joists, and connecting to fittings at almost any angle — without collapsing or losing its shape.
The aluminium construction brings some genuinely useful properties to any installation:
- Heat resistance. Aluminium handles elevated temperatures comfortably, making flexible aluminium duct a reliable choice for kitchen extraction and other applications where ducting is exposed to warm air.
- Moisture resistance. Unlike some materials, aluminium doesn't absorb moisture — which matters in bathrooms, kitchens, and humid commercial environments where condensation is a constant consideration.
- Lightweight and easy to handle. Aluminium ducting is significantly lighter than rigid steel or PVC alternatives, making it quicker and easier to work with — particularly in overhead or confined space installations.
- Simple to cut and trim. No specialist tools are required. A sharp pair of tin snips or heavy-duty scissors is all you need to cut flexible aluminium ducting cleanly to length.
Where Flexible Aluminium Ducting Is Used
Aluminium flexible duct is one of the most widely used ventilation products across domestic, commercial, and industrial settings. Here's where our customers typically put it to work:
- At home, it's the standard choice for connecting bathroom extractor fans and kitchen cooker hoods to their wall or ceiling exit points. It handles warm, moist air without issue and is easy enough for confident DIYers to install themselves.
- In commercial kitchens, flexible aluminium ducting connects extraction equipment to external venting points quickly and reliably. Its heat tolerance and ease of installation make it a practical choice for kitchen fit-outs where speed and dependability are both priorities.
- In commercial and office buildings, aluminium ducting forms connection runs within larger HVAC systems — perfect for linking rigid ductwork to terminal grilles, diffusers, and ventilation units where a degree of flexibility is needed for alignment or vibration absorption.
- In industrial environments, aluminium ducts are used in supply and extract air systems, process ventilation, and air handling installations across manufacturing, warehousing, and production facilities.
Choosing the Right Diameter
Picking the correct size is straightforward — just match the duct diameter to your fan or unit's outlet size.
- 102mm aluminium flexible ducting is the most popular size for domestic use, fitting the majority of standard bathroom fans and smaller kitchen extractors. If you're replacing existing ducting at home, this is almost certainly the size you need.
- 150mm aluminium flexible ducting is used for higher-capacity fans, larger cooker hoods, and light commercial ventilation systems that require greater airflow.
- Larger diameters are available for industrial ventilation, commercial HVAC systems, and air handling units that require high airflow volumes.
Check your fan or unit's outlet diameter in the product specification before ordering. It's a quick check that makes the whole process smoother.
How to Install Aluminium Flexible Ducting Correctly
Aluminium flexible ducting is one of the more forgiving products to install — but a few straightforward practices will make sure your ventilation system performs at its best:
- Keep the run as short and direct as possible. Airflow resistance increases with every metre of duct and every bend. A short, direct run means your fan works more efficiently and moves more air.
- Don't pull it fully extended. Flexible aluminium ducting performs better with a little slack — slightly compressed rather than stretched tight. This maintains the corrugated structure and reduces airflow resistance.
- Use aluminium foil tape on all joints. It bonds well to aluminium surfaces, withstands temperature changes, and keeps connections properly airtight. Standard tape is not a suitable substitute, as it can lose adhesion at high temperatures, degrade over time, and cause air leaks.
- Support longer runs. For runs over about a metre, use duct clips or hangers to support the ducting and prevent sagging. Sagging restricts airflow and creates low points where moisture can collect.
- Cut cleanly and fold back sharp edges. Use tin snips for a clean cut, fold back any exposed wire ends, and seal the cut end with aluminium foil tape before connecting to your fitting.
Aluminium flexible ducting varies considerably in quality. Thin foil layers, weak wire frames, and inconsistent sizing are common in lower-grade products — and those issues tend to show up during installation or shortly after. Foil that tears when you flex it, cores that collapse under their own weight, or connections that won't seat properly are frustrating at best and costly at worst.
Our aluminium flexible ducting is manufactured to a consistent standard — robust foil construction, sturdy wire helices, and reliable dimensions throughout. Whether you're buying a single length for a bathroom installation or ordering in volume for a commercial project, you're getting a product that installs cleanly and performs reliably over the long term. You can shop with confidence knowing you're getting ducting that does the job properly. If you need any suggestions or have any questions, please feel free to reach out to us via email sales@flexibleducting.com or by calling0117 330 2277.
FAQs
1. What is aluminium flexible ducting used for?
Aluminium flexible ducting is used to carry air between ventilation fans, extractor hoods, air handling units, and their exit points — wall vents, roof cowls, or external grilles. It's used across domestic bathrooms and kitchens, commercial kitchens, office HVAC systems, and industrial ventilation installations. Its flexibility makes it particularly well-suited to installations where rigid ducting would be difficult to route.
2. Can I use aluminium flexible ducting for a kitchen extractor fan?
Yes — it's well suited to kitchen extraction. Aluminium handles heat well and resists grease and moisture, making it a practical choice for cooker hood connections. Keep the run as short and direct as possible, seal all joints with aluminium foil tape, and make sure the diameter matches your hood's outlet for the best results.
3. How do I cut aluminium flexible ducting to length?
Compress the duct slightly at the cut point, then use tin snips or heavy-duty scissors to cut cleanly through the foil and wire. Fold back any sharp wire ends, trim the foil neatly, and seal the cut end with aluminium foil tape before connecting to your fitting. No specialist tools required.
4. Is flexible aluminium ducting the same as insulated flexible ducting?
No — standard aluminium flexible ducting is the inner duct only, with no thermal jacket. Insulated, flexible ducting wraps the same inner core in a layer of insulation and a protective outer sleeve. For runs through cold spaces like lofts or external wall cavities, insulated ducting is generally the better choice to prevent heat loss and condensation. For short internal runs in warm environments, standard aluminium flexible ducting works perfectly well.
5. Can aluminium flexible ducting be used outdoors?
Aluminium flexible ducting is designed for internal use. Any section exposed to outdoor conditions — UV, rain, or significant temperature variation — should be protected or replaced with a weather-rated product. Terminal fittings such as wall vents and roof cowls should always be externally rated.