Air Tightness

[richo106]

21 minutes ago, SteamyTea said:

Not really, it is just physics.

MVHR gives you controlled ventilation, and to a certain extent, controls humidity, while also recovering energy.

Mechanical ventilation does the same, but without the heat recovery.

 

You can, if you want, just pump external air into the building and hope that there are enough, evenly spaced, leaks that the system works.

 

I am currently improving my airtightness, in my already good house. For ventilation I will, for this winter, just open a window.

So an MVHR will still help my property even though the ACH isn't below 0.6?

 

 

[SteamyTea]

3 minutes ago, richo106 said:

So an MVHR will still help my property even though the ACH isn't below 0.6?

 

 

I would have thought so.

Obviously if the ACH are 20, any heat recovery will not be noticeable.

Aim to get it down to 1, then you will probably get 2.5.

 

It is all in the detail, and then odd things that you cannot see.

Make no assumptions and assume every nook, cranny and flat surface leaks.