Best Ventilation & Ducting — 100mm x 5m (2026)
1 ventilation & ducting matching size “100mm x 5m”, hand-picked from UK Amazon listings.
Not sure which one to pick? Read our Best Ventilation & Ducting UK (2026) guide.
This 100mm x 5m ventilation & ducting kit is designed for targeted airflow in smaller spaces, offering a practical solution for improving air quality. The extended length – 5 metres – provides flexibility in routing the ductwork to reach specific areas within a room or building. This particular size (100mm diameter) is well-suited for applications where minimising obstruction and maintaining airflow velocity are crucial.
The kit’s components allow you to create a bespoke ventilation system, ideal for use in conservatories, small bedrooms, or workshops. Careful planning of the ducting run is essential to ensure optimal performance; consider factors such as bends and obstructions that could reduce airflow efficiency. It's important to note this kit does not include any mounting hardware or fittings – you will need to source these separately.
This ventilation system is best suited for supplementing existing natural ventilation, particularly in areas with limited access to open windows. Installation should be carried out by someone familiar with basic plumbing and building regulations. Ensure the ducting is securely fixed to prevent vibration and maintain airflow integrity. Always check local building codes before installation.
#1 Pick
Hon&Guan 4 Inch Aluminium PVC Ventilation Air Ducting Flexible Hose 100mm with 2 Clamps (100mm x 5m, Black)- Aluminium PVC
- 100mm x 5m
£7.99
Pros
- 5m length with 2 clamps included covers most dryer and fan runs
- Flexible aluminium/PVC construction resists kinking
- Budget price with a very high review count
Cons
- Included clamps are on the small side for some fittings
FAQ
What materials are these ducts made from?+
The ventilation & ducting kit utilises flexible PVC for both the main ducting and connecting sleeves. This material offers good durability, resistance to moisture and is relatively lightweight, facilitating easy installation.
How much airflow can I expect from a 100mm x 5m system?+
The achievable airflow will depend significantly on factors like fan speed and ductwork bends. Generally, you can anticipate around 250-400 cubic feet per minute (CFM) at a typical low-speed extractor fan – however, testing is recommended.
What tools do I need to install this?+
You’ll require basic hand tools such as a measuring tape, cutter/knife for PVC, and potentially some duct sealant or cable clips for securing the ducting. A pipe wrench might be helpful depending on your connection method.
Can this kit be used outdoors?+
While the PVC is weather-resistant, prolonged exposure to direct sunlight and extreme temperatures isn't ideal. We recommend using UV-protected sealant and limiting outdoor use to shaded areas or short periods.
Are there any specific regulations I need to consider?+
Always check your local building codes before installation. Ventilation systems may be subject to regulations regarding airflow rates and exhaust discharge locations – ensuring compliance is crucial.
What size fan would you recommend for this ducting?+
A low-speed extractor fan rated around 100-150 CFM should be suitable for this 100mm x 5m kit. Selecting a higher CFM fan may overwhelm the system and reduce airflow efficiency.
Does this kit include any connectors or fittings?+
No, this kit only includes the main ducting sections. You’ll need to purchase additional connectors (e.g., elbows, tees) and mounting brackets separately to complete your installation based on your needs.
How do I seal gaps in the ductwork to prevent leaks?+
Use a suitable PVC sealant specifically designed for flexible ducting to create airtight seals at all joints and connections. Regular checks are advised to ensure continued tightness.
What is the maximum allowable bend radius for this ducting?+
The recommended minimum bend radius for this 100mm ducting is 6 times the diameter (600mm). Bends beyond this will significantly reduce airflow and should be avoided where possible.
Is this kit suitable for connecting to a trickle radiator?+
This system would likely require significant modification and careful planning to connect effectively with a trickle radiator. It's generally better suited as an independent extraction or supply ventilation solution.