Decent quality semi-rigid / semi-flexible duct.

[JCB400]

I'm designing the ventilation arrangements for my landlocked utility room. I'll be using as much rigid duct as possible, but it's inevitable that I'll need some sort of flexible duct in the system.

 

The flexible ducting options do not appear to be great. Generally it's either the very thin white helixed PVC stuff, which is poor for airflow and not robust, or the semi-rigid / semi-flexible aluminium duct, which is also not terribly robust and prone to tearing / denting etc.

 

The proper semi-rigid duct used for radial MVHR systems would be great, but it's only available in the smaller sizes used in those systems.

 

I have feelers out with some ventilation suppliers, but does anybody have any knowledge or experience of any decent options for 125 mm flexible-ish duct please? I'm looking for:

 

• As smooth a bore as possible for airflow
• Robust (e.g. vs tearing, mice, denting etc.)
• Good longevity
• Reasonable flexibility
• Available in 125 mm (sometimes 127 mm) and able to be make an airtight connection to normal male 125 mm spigots and connectors in the rest of the system (e.g. can it be squeezed tight with a jubilee clip)

 

Thanks.

Edited November 1, 2021 by JCB400

[markc]

Search dust extractor ducting, tough stuff

[JCB400]

4 minutes ago, markc said:

Search dust extractor ducting, tough stuff

 

Yeah, the EOLO L stuff is at the top of my list at the moment but I'm open to further suggestions.

[tonyshouse]

Svara fan can adjust via an app, run 24/7 let it think for itself then adjust if you are not happy, theoretically doesn’t work but does in practice 

[cherryfountain]

Have you looked at Frankische MVHR in Hastings.

[hb1982]

Actually I would advise to use "Semi-rigid Aluminium", pretty strong for residential application, not really prone to tear in my experience.