Hello everyone,
I recently joined this forum because we are currently quite frustrated with the topic of ventilation.
Our construction project starts at the end of April.
It is a solid brick/Poroton house, a single-family home with 200 m² (2,150 sq ft) of living space on two levels. KfW 55 energy standard.
I can’t really explain it, but I can’t decide on a central ventilation system because of the long duct lengths inside the house. I know that all pipes are clean and protected by filters, but my gut feeling just doesn’t agree.
With decentralized systems, we are bothered by the fans on the exterior walls in every room.
Now we are looking for an alternative.
We also didn’t find window frame ventilators very appealing.
So my question is:
Has anyone else experienced this or does anyone know of another system?
We learned about a system available through Baufritz houses with air transfer grills. However, it is only distributed through Baufritz.
It’s a central ventilation system that blows air directly into the house over a short distance and then distributes it further via transfer grills above the doors.
I look forward to your input and help.
The undecided homeowner
I recently joined this forum because we are currently quite frustrated with the topic of ventilation.
Our construction project starts at the end of April.
It is a solid brick/Poroton house, a single-family home with 200 m² (2,150 sq ft) of living space on two levels. KfW 55 energy standard.
I can’t really explain it, but I can’t decide on a central ventilation system because of the long duct lengths inside the house. I know that all pipes are clean and protected by filters, but my gut feeling just doesn’t agree.
With decentralized systems, we are bothered by the fans on the exterior walls in every room.
Now we are looking for an alternative.
We also didn’t find window frame ventilators very appealing.
So my question is:
Has anyone else experienced this or does anyone know of another system?
We learned about a system available through Baufritz houses with air transfer grills. However, it is only distributed through Baufritz.
It’s a central ventilation system that blows air directly into the house over a short distance and then distributes it further via transfer grills above the doors.
I look forward to your input and help.
The undecided homeowner
R
RotorMotor5 Apr 2021 09:08hampshire schrieb:
CO2 ppm only measured sporadically with a rental device, sleeping with the window closed, still below 200 ppm in the morning. Something doesn’t add up. Is there a zero missing, or how do you get indoor values lower than outdoor levels?
Basically, I believe that if you prefer to rely on your feelings and feel comfortable with that, you shouldn’t argue using “facts.”
K
knalltüte5 Apr 2021 09:14I believe @hampshire lives almost in the forest, so 200 ppm CO2 might be achievable? Adding a zero would be too much.
H
hampshire5 Apr 2021 09:15RotorMotor schrieb:
Something doesn’t add up. Is a zero missing, or how are you getting values inside that are below the outside measurements?You’re right, what did we actually measure there? Now I’m more interested—order a device and report back.Yes, the deciduous forest extends right up to the house and the neighbors are far away, but it’s still too little.
R
RotorMotor5 Apr 2021 09:25superzapp schrieb:
I think @hampshire lives almost in the forest, so maybe 200ppm CO2 could be achieved? In dense forests, 200ppm can probably be reached, but 1. it’s more likely a village or small town, and 2. that applies only in the forest, not inside a closed house after a whole night.
superzapp schrieb:
Adding a zero would be too much. How do you figure?
Unfortunately, 2000ppm CO2 is a common level in unventilated bedrooms.
On HTD, you’ll find many examples where even with controlled residential ventilation, levels reach that range.
hampshire schrieb:
Humidity levels were between 43 and 56%, with drops only occurring during rapid temperature increases caused by fully opening windows when outdoor temperatures were higher. Source: Froggit weather station indoor sensor – CO2 ppm was measured sporadically using a loaned device. Sleeping with the window closed, CO2 levels were still below 200 ppm in the morning. Of course, this depends a lot on room volume, since CO2 is not absorbed by materials like moisture is. In smaller rooms, sleeping is more comfortable with air exchange through an open window or other ventilation.
Our solution excluded KfW funding, requires some work, and is largely independent of an external utility provider.
Many roads lead to Rome.
@Unentschlossen has made a decision. Glad to hear you have made progress. Consider a system with an enthalpy heat exchanger for good humidity control. So you sleep in a straw bed, in a nature reserve remote from civilization, under the open sky?
U
Unentschlossen5 Apr 2021 09:52So, back to the topic. Is there anyone here who has found a system similar to Baufritz? No vents all over the facade, but also no complicated ductwork—just air flowing out once and then circulating throughout the house without pipes. It doesn't have to be efficient or cost-effective. It's purely about comfort, a luxury to avoid having to ventilate manually.