PVC Ducting — Lightweight, Durable & Built to Last
Not every ventilation project calls for the most complex solution. Sometimes what you need is a ducting product that's straightforward to work with, holds up well over time, and does its job without any drama. That's exactly where PVC ducting earns its place.
Used across domestic, commercial, and light industrial ventilation systems, PVC air ducting is one of the most widely specified duct materials available — and for good reason. It's lightweight, moisture-resistant, easy to cut and join, and available in a range of sizes to suit everything from a single bathroom extractor to a multi-room commercial ventilation system.
Here's everything you need to know to choose the right PVC duct for your project and get the installation right the first time.
What Is PVC Ducting?
PVC ducting is a type of ventilation pipe and fittings manufactured from polyvinyl chloride — a robust, lightweight plastic that handles moisture, temperature fluctuations, and everyday wear well. It's available in both rigid and flexible formats, giving it genuine versatility across a wide range of installation types.
- Rigid PVC duct pipe is used for permanent, fixed ventilation runs — typically installed within walls, ceilings, or floor voids. Its smooth inner surface reduces airflow resistance, allowing fans and ventilation units to operate efficiently without encountering resistance from the ductwork. Rigid PVC ducting also connects cleanly and securely with purpose-made fittings, making for a neat, professional installation.
- Flexible PVC ducting offers a degree of bend and movement that rigid pipe can't, making it useful for connection runs where some flexibility is needed — such as linking a semi-rigid duct run to a fan or terminal fitting, or routing through spaces where a rigid pipe would be difficult to manoeuvre.
Together, rigid and PVC flexible ducting cover the vast majority of ventilation requirements across domestic, commercial, and light industrial settings.
Where Is PVC Ducting Used?
PVC air ducting is a genuinely versatile product. Here's where our customers typically put it to work:
- Domestic bathrooms and kitchens — PVC ducting is a popular choice for bathroom extractor fans and kitchen ventilation. It handles the warm, moist air these spaces produce without deteriorating, and it installs cleanly within stud walls, ceiling voids, and under-floor spaces. The smooth inner surface of rigid PVC duct pipe also makes it easier to keep clean compared to corrugated alternatives.
- Commercial ventilation systems — In offices, retail units, and commercial kitchens, PVC air ducts are used for supply and extract ventilation runs. Its durability and moisture resistance make it a practical choice in environments where the ducting may be exposed to varying humidity levels or temperature swings.
- Light industrial applications — PVC ducts are used in workshops, storage facilities, and light manufacturing environments for general ventilation and fume extraction. The material handles exposure to mild chemicals and airborne particles well, making it suitable for environments where less robust materials would degrade over time.
- Whole-house ventilation and MVHR systems — Rigid PVC duct pipe is commonly used for fixed duct runs, where clean, airtight connections and low airflow resistance are important for system efficiency.
Choosing the Right Size
Getting the diameter right keeps your ventilation system running efficiently.
- 102mm PVC ducting — The standard size for most domestic applications, compatible with most bathroom fans, kitchen extractors, and smaller ventilation units. If you're replacing existing ducting at home, this is the size you'll most likely need.
- 127mm PVC ducting — Used for higher-capacity fans, larger kitchen extraction systems, and light commercial ventilation where greater airflow is required.
- Larger diameters — Available for commercial HVAC systems and industrial ventilation applications where high airflow volumes are a requirement.
Always check your fan or ventilation unit's outlet diameter before ordering — it'll be listed in the product specification and takes seconds to confirm, before you choose the right duct size.
The Practical Advantages of PVC Ducting With Us
It's worth understanding what makes PVC ducting a popular choice, particularly when there are other materials available:
- Moisture resistance — PVC doesn't absorb water and won't rust, corrode, or swell when exposed to humidity. This makes it particularly well-suited to bathrooms, kitchens, and any application where the ducting is regularly exposed to moist air.
- Lightweight and easy to handle — PVC duct pipe is significantly lighter than metal alternatives, making it easier and quicker to work with, particularly in overhead installations or confined spaces.
- Smooth inner surface — The smooth bore of rigid PVC ducting creates less friction resistance to airflow than corrugated flexible alternatives. This means your fan or ventilation unit can move air more efficiently, which can make a real difference in longer duct runs.
- Easy to cut and join — PVC duct pipe cuts cleanly with a standard hacksaw or pipe cutter and joins securely with purpose-made push-fit or solvent-weld fittings. No specialist tools or skills are needed for a clean, professional installation.
- Durable and long-lasting — PVC is a robust material that holds up well to everyday conditions. A properly installed PVC ventilation system will perform reliably for many years without requiring maintenance or replacement.
FAQs
1. What is PVC ducting used for?
PVC ducting is used to carry air through ventilation systems in domestic, commercial, and light industrial buildings. Common applications include bathroom extractor fans, kitchen ventilation, whole-house MVHR systems, commercial HVAC installations, and light industrial fume extraction. Its moisture resistance, durability, and ease of installation make it one of the most widely used ventilation duct materials available.
2. What's the difference between rigid and flexible PVC ducting?
Rigid PVC duct pipe is used for fixed, permanent ventilation runs — typically installed within walls, ceilings, or floor voids. It offers a smooth inner bore, low airflow resistance, and clean, secure connections using purpose-made fittings. Flexible PVC ducting is used where some movement or bend is needed — such as connection runs between rigid ductwork and fans or terminal fittings. Many installations use both: rigid pipe for the main run and flexible PVC ducting at connection points.
3. What size PVC ducting do I need for a bathroom fan?
Most standard domestic bathroom fans have a 100mm outlet, making 100mm PVC ducting the most common choice for bathroom installations. Check your fan's specification to confirm the outlet diameter before ordering.
4. Can PVC ducting be used in kitchens?
Yes — PVC air ducting handles the warm, moisture-laden air produced in kitchens well, and its smooth inner surface is easy to keep clean. For kitchen installations, keep the duct run as short and direct as possible and ensure all joints are properly sealed. For cooker hood extraction that carries heavy grease-laden air, always check that your chosen product is suitable for cooking extraction.
5. Is PVC ducting suitable for outdoor use?
Standard PVC ducting is designed primarily for internal use. Any section of duct exposed to outdoor conditions — UV light, rain, or significant temperature variation — should be protected or replaced with an externally rated product. Terminal fittings such as wall vents, louvre grilles, and roof cowls should always be weather-rated for any external application.
6. How do I cut PVC duct pipe to length?
PVC duct pipe cuts cleanly and easily with a standard hacksaw or pipe cutter. Mark the cut point clearly, cut squarely to ensure a good fit with fittings, and remove any burrs from the cut edge with a deburring tool or fine sandpaper before connecting to fittings. A clean, square cut makes for a better seal and a neater finish.
7. How does PVC ducting compare to aluminium flexible ducting?
Both are widely used ventilation duct materials, but they suit different applications. PVC duct pipe — particularly rigid PVC — offers a smooth inner bore, low airflow resistance, and a clean, permanent installation. Aluminium flexible ducting is more flexible, easier to route through tight spaces, and quicker to install in complex runs. For straightforward, fixed ventilation runs where a neat finish matters, rigid PVC is often the better choice. For installations requiring flexibility and quick connection, aluminium flexible ducting has the edge.
8. Does PVC ducting need insulating?
Standard PVC ducting does not include a thermal insulation layer. If your duct run passes through cold spaces — such as an unheated loft, roof void, or external wall cavity — adding duct insulation or using an insulated ducting product for that section of the run will prevent heat loss and condensation. For internal runs in conditioned spaces, standard PVC ducting performs well without additional insulation.