Round Plastic Ducting 100mm Diameter

Rigid PVC Ventilation Pipe

Our 100mm ducting is a best seller for domestic and light commercial ventilation. Made from rigid PVCu, this 100mm round ducting keeps airflow smooth thanks to its low-resistance bore and robust construction. It’s a great fit for bathroom extractor fans, smaller domestic kitchen hoods, utility rooms and general HVAC/MVHR runs where a compact size is required. Alongside 100mm plastic ducting pipe, we stock a full set of matching 100mm duct fittings – bends, straight connectors, tees, reducers, grilles and dampers – so you can complete a neat, push-fit installation end to end.

Key benefits

Low resistance – smooth internal bore helps keep pressure drop down.
Rigid & durable – solid (rigid) PVCu resists crushing and knocks.
Push-fit system – the pipe has a large end (Female) to marry up with standard fittings 100mm male spigots.
Easy to cut – trim to length with a fine-tooth saw or hacksaw.
Compatible range – wide choice of 100mm plastic ducting bends, connectors, and reducers.

Technical details

Property	Detail
Nominal diameter	100mm (round)
Material	Rigid PVCu (white)
Finish	Smooth-bore, wipe-clean surface
Operating temperature (typical)	Approx. −15 °C to +60 °C
Corrosion/UV	Non-corrosive, UV-stabilised plastic

Installation tips

Plan short, straight runs to keep airflow high; avoid tight bends where possible.
Push-fit fully so the female socket seats over the male spigot on the fitting.
Join pipe to pipe with a 100mm straight connector (male-to-male).
Secure the joints with self drill screws
Seal every joint with duct mastic and foil tape for an airtight finish.
Insulate in cold spaces (lofts/garages) to reduce condensation and heat loss.

Typical applications

Bathroom/toilet extractor fan ducting 100mm
Compact cooker hood runs (check manufacturer guidance)
Positive Input Ventilation (PIV) and small MVHR branches
General supply/extract in domestic ventilation

100mm Round Plastic Ducting FAQs

- Is 100mm rigid ducting better than flexible for bathrooms?
For most bathroom fans, 100mm rigid ducting gives smoother airflow than flex and helps the fan move air more efficiently. Use short sections of flex only where needed for vibration or alignment.
- Can I use 100mm ducting for a domestic cooker hood?
Many hoods support 100mm, though some perform better with 125mm or 150mm. If your hood offers multiple sizes, pick the largest size available for the best extraction and lowest noise. Keep the run short and avoid sharp bends.
- How do I connect two lengths of 100mm duct pipe?
Use a 100mm straight connector (male-to-male). Push the pipe fully home on both sides, then secure with self drill screws & seal with mastic and foil tape.
- Can I step between sizes (e.g., 100mm to 125mm or 150mm)?
Yes – use the appropriate reducer or increaser. Stepping up to a larger size can help reduce resistance, but airflow will still be limited by the smallest section in the run.
- What’s the difference between 100mm rigid and “solid” ducting?
They’re the same thing in this context. “Rigid”, “solid” or “PVC” ducting refers to hard plastic pipe and fittings (not flexible hose).
- Do I need to insulate 100mm ducting?
If warm, moist air passes through unheated areas, add insulation (or use insulated sections nearby) to help prevent condensation and heat loss.

Need a hand?

If you’re unsure which 100mm plastic ducting parts you need, our team can help you choose the right pipe, connectors, bends and reducers for your setup. Order online for fast UK delivery or contact us for advice.