Decentralised Mechanical Ventilation with Heat Recovery dMVHR

[Tim_Gilbert]

I wrote in 2021 that there are single room MVHRs with short ducts. At the time I hadn’t seen one for a while and I haven’t seen one since, so that methodology may have been abandoned. If you are multilingual it may be worth searching for what is available elsewhere.

That last comment gave me an idea and I checked Norwegian websites. There was a possible candidate, which was basically a fully ducted very small unit, designed for small open plan flats.

Retrofit Ventilation

Single room MVHR systems are of two types. Those with one opening have a heat absorbing element. They take room air and expel it through the element. Then after a short interval the air direction changes and outside air is directed through the same element, absorbing heat as it goes. The cycle then starts at the beginning again. Those with two openings to the outside world work just like a whole house system except that there are no ducts to other rooms. By that I mean that they simultaneo…