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MVHR ducting and airflow design


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I'm leaning towards a demand controlled c-MEV (Renson Healthbox 3) which has varying sensors on each intake (H2O, VOC, CO2). However, such a fancy system costs around 1,400 and the ductwork isn't much less than an MVHR in my case (3 stories, all rooms but one around a central stairwell). I want to see how much an MVHR system would cost in terms of time and money so need a design for airflow, ducting, fan capacity etc. I can't find any books to help me, I can't find any methods on the Internet and I can't help wondering why.

 

Can anyone tell me where to find a guide to designing it? I bought a book in French but it mostly just set out their Building Regs rather than provide a 'How to'.

 

 

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39 minutes ago, Marvin said:

I sent information to the manufacturer of my small whole house system and they sent me a specification and layout.

They don't seem to do that here in France. What's more I'm only investigating the possibility of MVHR, so I'm not sure they'd want to do that for me. Since posting, I have, however, found a free program provided by the Belgian version of the BRE. It is very detailed and will design your system for you! Two catches; it specifies to Belgian regs and is in French. It's at cstc.be. Does drawings and everything :)

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