Hello everyone,
we are building a KfW 70 house, which is economic even without a mechanical ventilation system.
Now, like many others, we are uncertain whether we really want to install a mechanical ventilation system. It has been planned, but the prices quoted are quite high... A decentralized system also seems to be similarly expensive due to the number of rooms and additionally causes quite a few holes in the nice facade...
Our heating engineer, who also installs ventilation systems, suggested installing fans in the exterior walls of the wet rooms (guest toilet and bathroom). These would be controlled by a switch and/or humidity sensors to extract the moist air from the rooms.
Additionally, a cooker hood with exhaust ventilation is recommended for the kitchen.
What do you think about this?
From a cost perspective, it does seem to be considerably cheaper.
we are building a KfW 70 house, which is economic even without a mechanical ventilation system.
Now, like many others, we are uncertain whether we really want to install a mechanical ventilation system. It has been planned, but the prices quoted are quite high... A decentralized system also seems to be similarly expensive due to the number of rooms and additionally causes quite a few holes in the nice facade...
Our heating engineer, who also installs ventilation systems, suggested installing fans in the exterior walls of the wet rooms (guest toilet and bathroom). These would be controlled by a switch and/or humidity sensors to extract the moist air from the rooms.
Additionally, a cooker hood with exhaust ventilation is recommended for the kitchen.
What do you think about this?
From a cost perspective, it does seem to be considerably cheaper.
D
DerBjoern3 Dec 2013 11:57If you want to ensure ventilation through the choice of building materials, you need perforated foil as a vapor retarder and window systems without sealing beads, etc.
D
DerBjoern3 Dec 2013 11:58But there is no doubt that it is also possible without a mechanical ventilation system. There are other ways to ventilate, for sure. But DEFINITELY not THROUGH THE WALLS!!!
N
nordanney3 Dec 2013 12:15fragri schrieb:
Costs are certainly relative, but nowadays you can quickly lose the warranty if you don’t have a maintenance contract! So I do think that, if you consider building physics, it is quite possible to manage well in a building without mechanical ventilation with heat recovery. Warranty only with a maintenance contract??? That’s not the case, at least not for mechanical ventilation with heat recovery. Consider building physics! Yes, but then you have to be home regularly (including at night) to ventilate the house properly. This only works without vacations and if a partner is always home to open the windows wide. At the moment, when we wake up in the morning, the bedroom smells like a puma cage and moisture has condensed on the windows (two adults and a small child in a 40m² (430ft²) bedroom). Over time, the window frames get quite moldy (you can clean it, but it’s not pleasant) – our current house is only 9 years old and was well built (by 2004 standards).
D
DerBjoern3 Dec 2013 12:20fragri schrieb:
But a centralized mechanical ventilation system that exchanges air in all rooms, filters it, and even aromatizes it seems unnecessary for our building project... Aromatizes? I've never heard of that before...
Of course, it’s possible to live without a mechanical ventilation system. You just have to ventilate differently, for example by manually opening windows or using trickle vents, and so on.
Because contrary to your assumption, your walls don’t do that!
Mechanical ventilation is primarily about comfort.
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