Is KFW 40+ also possible with a decentralized ventilation system?

  • Erstellt am 2019-12-04 08:00:48

Specki

2019-12-04 08:00:48
  • #1
Good morning,

I have a question that I couldn’t find a clear answer to on the internet. Maybe someone here knows for sure. Is a central ventilation system mandatory for a Kfw 40+ residential unit (it is supposed to be a multi-family house), or is a decentralized ventilation system with heat recovery also acceptable?

I think a decentralized system should also be possible, since the KFW apparently only requires a ventilation system with at least 80% heat recovery. And some decentralized systems can also meet this requirement.
However, in some places I have also read that a central system is absolutely necessary.
Maybe you can tell me more about this. Thanks a lot in advance

Regards
Specki
 

fragg

2019-12-04 08:07:20
  • #2
You can also have up to x euros of the consulting fees reimbursed.
 

Specki

2019-12-04 08:11:23
  • #3
That doesn't really help me now....
However it was meant.
 

boxandroof

2019-12-04 09:27:14
  • #4
Decentralized is probably more sensible for the apartment than centralized. Both are possible. Whether it can be done entirely without must be calculated. To my knowledge, it is not explicitly required, but I would assume that substitute measures like more insulation are more expensive and less sensible.
 

Specki

2019-12-04 09:42:28
  • #5
Two quotes from the KFW page:






On the KFW page, however, I cannot find any statement whether decentralized or centralized. And on the internet, I find contradictory information.
 

boxandroof

2019-12-04 11:59:09
  • #6
Controlled residential ventilation is not an add-on component, even if it may be stated that way by the KfW itself and you might practically not be able to avoid it. Centralized is not mandatory. You must achieve certain values for KfW 40 (without +) and the path to get there is not strictly prescribed, even if the KfW examples may look like that. You will not be able to avoid a calculation.
 

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