Looking for 180mm round duct supplier

[Eric]

I am looking for a supplier for 180mm dia plastic duct - just for the through the wall section on my MVHR install.

 

Does anyone know of a company that sells 180mm, can find everything apart from that size 🤔

[Nickfromwales]

CVC (Oxford) sell 180mm EPS insulated duct and fittings, and that's what I would use to go through the cold aspect of the wall. Single wall PVC is not great for this tbh, and I would avoid having anything other than the insulated (insulation) type duct from atmosphere all the way to the MVHR unit.

 

 

The only use of steel here was to connect/adapt for the metal box attenuators (silencers), the rest was "foam" insulation ductwork.

 

Is your unit in the heated / airtight envelope, or in a cold space?