Suitable ducting

[Tommy8884]

Hi. I'm a newbie to this. Just purchased a custom made MVHR and will be fitting in the loft. The unit is fitted with 150mm spigots for all 4 ports. I want to use as little flexible ducting as possible. I've found some cheap twin wall pipe (probably drainage). Looks very similar to the semi rigid MVHR stuff you get in 75mm but 150mm.  See attached pic

 

Is there any reason why j can't use this if I insulate it (will be in a loft). Or, am I missing something 

Edited February 20 by Tommy8884

[JohnMo]

If you're doing the MVHR, do it it with the correct stuff.

 

Do either galvansed duct with the all the silencers in a branch system. Or do a plenum system with semi rigid 70 or 90mm duct.

[Tommy8884]

Thanks for the reply. So I will use a plenum system for the to/from house vent points back to a manifold. I need 150mm duct to/from house and to the manifolds. Would the above duct work for that? Seems to be semi flexible but relatively smooth inside.

 

Thanks again

[JohnMo]

For the 150mm

 

Between outside to MVHR unit, and MVHR to manifold/plenums (they are the same thing) use something like Ubbink foam duct (or similar). This is a duct and the required insulation in one product.

 

Leave drains stuff in the ground. Doing drainage stuff.

[Mike]

8 hours ago, Tommy8884 said:

I need 150mm duct to/from house and to the manifolds. Would the above duct work for that?

Only if it can be jointed to pipes to BS EN 12237 sized joints - which is very unlikely.