ᐅ Central ventilation system – is humidity recovery necessary?
Created on: 30 Dec 2019 16:17
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ludwig88sta
Hello everyone,
for our planned single-family house with 2 floors and a basement, we have decided on a central ventilation system for all rooms with heat recovery within the thermal envelope. The brand and model are not yet determined.
I have read here on the forum a few times about an additional moisture recovery feature (MRF?), since otherwise the indoor air tends to become too dry (of course, the ventilation system also removes the moisture that naturally occurs in the room, which usually makes the air feel comfortable). I wanted to ask if anyone can confirm these issues and whether this is more common in timber frame houses or also occurs in brick houses?
Did you install additional moisture recovery in your ventilation system? How much extra cost does it involve? I assume there are also additional maintenance costs because it involves another motor and related components.
Best regards
ludwig88sta
for our planned single-family house with 2 floors and a basement, we have decided on a central ventilation system for all rooms with heat recovery within the thermal envelope. The brand and model are not yet determined.
I have read here on the forum a few times about an additional moisture recovery feature (MRF?), since otherwise the indoor air tends to become too dry (of course, the ventilation system also removes the moisture that naturally occurs in the room, which usually makes the air feel comfortable). I wanted to ask if anyone can confirm these issues and whether this is more common in timber frame houses or also occurs in brick houses?
Did you install additional moisture recovery in your ventilation system? How much extra cost does it involve? I assume there are also additional maintenance costs because it involves another motor and related components.
Best regards
ludwig88sta
L
ludwig88sta8 Jan 2020 17:09Lumpi_LE schrieb:
If it smells bad outside, it will also smell when airing normally.If it smells bad outside, then you don’t ventilate normally. At least that’s how I’m doing it right now in a house without mechanical ventilation with heat recovery, and I think most reasonable people do the same.
@tomtom79 do you have a mechanical ventilation system with heat recovery? With an F7 filter?
@Lumpi_LE Not with the standard one, as only the fins are exposed to the airflow. With the enthalpy heat exchanger, the air is mixed. This is what was stated in the Rosa Technik Forum. It might also depend on the manufacturer.
@ludwig88sta Yes, controlled residential ventilation but with F5 filter mat.
@ludwig88sta Yes, controlled residential ventilation but with F5 filter mat.
tomtom79 schrieb:
Yes, smoke is a problem... One of our neighbors doesn’t manage their fireplace very well—they burn all kinds of wood, regardless of whether it still has paint on it or not.I can confirm that—the annoying smoke from the neighbors unfortunately spreads into the house on some days.L
ludwig88sta8 Jan 2020 17:16I don’t know how much an upgrade to F7 during the next filter change would cost, but according to other forums, it should work. It’s definitely worth a try.
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boxandroof8 Jan 2020 17:17ludwig88sta schrieb:
What generally worries me a bit about the controlled residential ventilation system is that odors/smells from outside are distributed inside the house (smoke from fires, accidents, or even just farm smells in rural areas). There are supposed to be activated carbon filters for this, but they are said to be almost unaffordable. In other cases, the F7 filter has already helped somewhat against outdoor odors. Are there any experiences with this here? I can easily notice smoke inside. Then I open the window to check the situation.
I don’t notice agricultural fertilizer smells inside, even when they are quite strong outside. Of course, this could also be related to general odor perception and not necessarily the filter. We have F7 filters.
ludwig88sta schrieb:
Oh, you mean the house’s own odors/smells being circulated inside? We have a rotary heat exchanger. There is a defined purification zone for the air without heat recovery, but by design, a few percent of the exhaust air is not fully separated. You don’t really notice this, and odors spread more inside through open doors within the house.
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