Decentralised mvhr

[Jane W]

I have read some threads about decentralised mvhr like fresh-r and bluMartin. Has anybody decided on this option for their 2 storey newbuild, or seriously considered it but then decided against it?

[JohnMo]

When I did my new build I priced up Fresh-R, but got push back from building control on flow rate not matching building regs.

 

But the concept is good and can be made to work with ordinary MVHR units, using cascade ventilation. So extract from all wet rooms, add air in a central location, so it passes through other areas before being extracted. Between room fans if layout demands it.

[Mike]

dMVHR can be useful in an apartment or retrofit, but in a new-build house a central MVHR unit normally has the advantage. Only 2 holes to cut through the outside wall, only 2 visible external grilles, no visible boxes on the internal walls, constant-flow-rate fans to counteract the build-up of filter debris, only 1 set of filters to change, no worries about noise from fans or the outside world, many more units - PassiHaus-approved or otherwise - to choose from, the availability of a summer bypass (on good units), a single point of control, pre-heater and/or post-heater* options if needed, often lower installation costs (except in retrofit).

 

*could be added to ducted dMVHR too.

 

Edited January 17 by Mike