I want to build a single-family house according to the KfW55 standard. These houses are absolutely airtight, and the airtightness is verified with a blower door test. Is it allowed to operate a range hood in exhaust mode? For the exhaust, a duct with a diameter of 150 mm (6 inches) leading outside is required. Wouldn't this area then no longer be airtight?
We also plan to operate a controlled residential ventilation system, exhaust air, and a fireplace. The chimney sweep and energy consultant were consulted, and here is the response from the energy consultant.
The exhaust air is planned to be routed outside through a DN150 (approximately 6-inch) opening in the floor slab.
“...from the KfW’s perspective, the range hood can be disregarded. Since it represents a small, localized thermal bridge, it does not need to be included in the energy balance calculation.
Regarding the blower door test, the external opening of the system is included in the calculation but should not have a significant impact, as the external opening is relatively small.
A special external flap is not required.”
The exhaust air is planned to be routed outside through a DN150 (approximately 6-inch) opening in the floor slab.
Tarnari schrieb:
not because it doesn’t work, but because it is very complex and therefore expensive when combined with a controlled mechanical ventilation system with heat recovery.
For example, an automatic window opener must be installed, so a window opens automatically as soon as the exhaust air system turns on. That’s how it was explained to us as well. Especially if you add a fireplace, like we have.
Then you also need a negative pressure (or air pressure or something similar) monitor to control the system, so that not too much air escapes and not too little fresh air comes in. Plus a window contact sensor.
That was all too complicated for us 🙂
We are now doing a recirculation system, central controlled mechanical ventilation, and a gas fireplace.
S
Stefan00130 Jun 2021 15:43Yaso2.0 schrieb:
This is how it was explained to us as well, especially if a fireplace is added later, like in our case.
Then you also need a negative pressure (or air pressure or something similar) monitor that controls the system to prevent too much air from escaping and too little fresh air coming in. Plus a window contact sensor.
It all seemed too complicated to us 🙂
We are now installing a recirculation system, a centralized mechanical ventilation with heat recovery, and a gas fireplace. Well... too much air escaping is basically only a problem when a fireplace is involved since it affects the chimney.
If the air gets so thin that I start having breathing problems without a fireplace, I would just turn off the exhaust air first 😉
Or are there issues with negative pressure on the side of mechanical ventilation with heat recovery systems?
Stefan001 schrieb:
Well... losing too much air is usually only an issue with a fireplace since it affects the chimney draft.
If there is no fireplace, and the air gets so thin that I have trouble breathing, I would turn off the exhaust first 😉
Or are there any issues with negative pressure related to controlled residential ventilation systems? Check here, all the information came from: https://www.hausbau-forum.de/threads/kwl-kamin-abluft-fuer-Küche-funktioniert-das.37062/
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