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Zehnder Q350 Ducting sizes


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I think I’ve decided on the Zehnder Q350 with enthalpy exchanger, however the unit has 160mm duct spigots, whereas the most cost effective silencers and manifolds are 150mm 

I’ve also found some nice streamlined roof vents in 150mm.

Has anyone used a Zehnder unit and reduced the pipes down to 150mm, I’m assuming 10mm smaller won’t make much difference but I’m an MVHR virgin so would appreciate feedback for you more experienced guys 

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