ᐅ Is a ventilation system now mandatory for new buildings under the 2016 Energy Saving Ordinance?
Created on: 22 Feb 2017 13:53
C
Cunarder
Hello Forum,
I am new here and hope you can help.
It’s about our new build project, which is scheduled to start in April.
The goal is to build a KfW 55 house (solid construction). We originally planned to do this without a ventilation system.
However, we keep reading here and there that a ventilation system is mandatory for the KfW 55 certification.
Additionally, today the local utility company informed me that the 2016 Energy Saving Ordinance requires automatic ventilation. The builder, on the other hand, insists it is not necessarily required.
Can you help clarify this?
1. Is it really mandatory?
2. Can you manage well without it, or is it better to invest the money in a ventilation system?
I look forward to your advice.
Thank you very much.
I am new here and hope you can help.
It’s about our new build project, which is scheduled to start in April.
The goal is to build a KfW 55 house (solid construction). We originally planned to do this without a ventilation system.
However, we keep reading here and there that a ventilation system is mandatory for the KfW 55 certification.
Additionally, today the local utility company informed me that the 2016 Energy Saving Ordinance requires automatic ventilation. The builder, on the other hand, insists it is not necessarily required.
Can you help clarify this?
1. Is it really mandatory?
2. Can you manage well without it, or is it better to invest the money in a ventilation system?
I look forward to your advice.
Thank you very much.
S
stefanc8423 Feb 2017 02:14Unless the requirement is not calculated (from volume, orientation, window area, numerous factors…) but based on reference values without calculation, as mentioned earlier, then a mechanical ventilation system with heat recovery is mandatory.
And yes, even when using the calculation method, it can be challenging for a construction method with masonry without mechanical ventilation, but according to reports online, it is quite possible. For timber houses, it is generally almost standard anyway.
And yes, even when using the calculation method, it can be challenging for a construction method with masonry without mechanical ventilation, but according to reports online, it is quite possible. For timber houses, it is generally almost standard anyway.
stefanc84 schrieb:
THEN mechanical ventilation with heat recovery becomes mandatory.With the clarification that not all configurations require heat recovery, only central exhaust systems. But whether this is practically relevant ... I mention it here just for completeness.
However: Why use the reference value method? Then the combination is unrestricted.
C
Caspar202023 Feb 2017 08:31Additional Requirements for a KfW Efficiency House 40 Plus
A KfW Efficiency House 40 Plus meets the standards of a KfW Efficiency House 40 and includes the following additional features:
- An electricity-generating system based on renewable energy
- A stationary battery storage system (electricity storage)
- A ventilation system with heat recovery
- A visualization of electricity generation and consumption via a suitable user interface
Only with KfW 40 Plus is a controlled residential ventilation system with heat recovery explicitly required. Otherwise, a simple exhaust ventilation system could be sufficient. You just need to perform the calculations like @Alex85 and @stefanc84.
Most likely, small-scale home builders do not want or are not able to implement this; therefore, they generally focus on meeting the proof of compliance using reference values.
K
Komposthaufen23 Feb 2017 08:47There is a lot of debate here again, with people saying you “don’t have to” ventilate thanks to controlled residential ventilation systems. It sounds as if airing out the rooms is a terrible burden. I only know my/our own living habits, but we basically always have the bedroom windows open when we or the child are inside. From spring to autumn, we also keep many other rooms ventilated.
Komposthaufen schrieb:
I only know my/our living habits, but basically we always keep the windows open in the bedrooms when we or our child are inside. From spring to autumn, also in many other rooms. Do you also keep the windows open all the time in winter when someone is in the room?
K
Komposthaufen23 Feb 2017 08:54Mostly. Not every hour of the night and not at double-digit negative degrees Celsius, but still quite regularly. We sleep well in cool, clear air.
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