Decentralized Controlled Residential Ventilation + Fireplace Stove

Hello forum,

I am currently planning the upcoming renovation of our purchased house (bungalow-solid 120m², fully basemented, built in '75)

Planned renovations:
- Windows + roller shutters + front door
- Facade insulation + ceiling insulation top floor ceiling
- Gas condensing boiler heating with solar support
- Wood stove

Since I have read quite a bit about decentralized controlled residential ventilation with heat recovery, the question arises whether it is possible (and sensible) to integrate this.
Energetically it may not bring too much, but it should significantly increase comfort and above all greatly improve the indoor climate (keyword: fear of mold).

Planned so far:
- Fireplace without separate combustion air supply
- Exhaust range hood with negative pressure monitor (window contact switch is out of the question for us)

My questions about the combination with decentralized controlled residential ventilation:
1. Is an exhaust hood possible?
2. If not, is a negative pressure monitor required for recirculating range hood + controlled residential ventilation?
3. Must the wood stove be room air-independent with its own fresh air supply?
4. Is the controlled residential ventilation installed only in bedrooms (as I have read) or also in bathroom + kitchen?

Questions and more questions....
Maybe some of you have a similar combination in use. I would be happy to hear about experiences.

Regards

Gebuesch

Hello Gebuesch, regarding question 1, in principle, an exhaust hood is possible but not sensible from a ventilation technology perspective. These systems operate with an air volume of 300-700 m³/h. Firstly, it is a waste of heating energy, and secondly, where is the air coming from to be replaced? Better is a recirculation hood in combination with an exhaust fan that only produces about 80 m³/h. Question 2: With a recirculation hood in connection with [Kontrollierte-Wohnraumlüftung], no air pressure monitor is needed, only with a pure exhaust hood. However, if you install a wood stove, you always need an air pressure monitor that shuts down the system in case of negative pressure. (Required by the chimney sweep) Question 3: The wood stove should basically receive combustion air independent of the room air. Question 4: The decentralized [Kontrollierte-Wohnraumlüftung] is installed in all living rooms such as living room, children's and bedrooms, as well as study rooms etc. Exhaust air controlled by humidity should be installed in the bathroom and possibly in the guest WC as well as the kitchen. (see question 1) Regards HIGIL

1. Extractor hood possible, but only with window sensor. Unfortunately, this does not fit with the concept of controlled residential ventilation. Just like leaving windows open at night.
2. With recirculation, you do not need a pressure monitor.
3. The stove should be room-air independent, otherwise the same applies as with the extractor hood. Whether you need a pressure monitor depends on the ventilation system itself and the stove installed. We have a Zehnder system and an Olsberg stove, and do not need a pressure monitor. There is a building regulation approval. But since we open a window slightly when operating the stove anyway, because otherwise it becomes too hot in the living area, it actually doesn’t matter.
4. The biggest advantage is that the humid air from the wet rooms (boiler room, laundry room, kitchen, and bathrooms) is vented out of the house. That is why there should be exhaust vents there, and supply vents in the living rooms.