Dry air in the room

Hello everyone,
dry indoor air will become a common problem with the increase of legal requirements for indoor ventilation regarding mechanical ventilation systems.

There are already systems with integrated humidifiers, but experts disagree on the indoor air pollution with mold, etc. The technicians say: "The filters and humidifiers must be regularly maintained, then nothing will happen." The building biologists and doctors rather see the danger that mold risk might arise. There are experiences in both directions.

I myself am not a fan of mechanical ventilation systems; let's see what technology will bring in the future.

@Dämmunsinn: You want dry air? Best with 0% or what?

hello

sorry, but that would be best for us humans.

So especially when buying humidifiers, I would pay attention to tested products if the goal is not to purchase a bacteria breeding ground
What simply interests me is why mold formation should occur

Hello craftsmen,
Did I understand correctly that you are interested in why mold can occur in ventilation systems with humidifiers or in humidifiers?

Here is the reason:
Indoor air is filled with a variety of tiny particles, microorganisms, fibers, skin flakes, bacteria, mold spores... Most of these tiny particles are produced inside the house itself, others enter the house through ventilation processes.
Molds, which are present in large numbers in and around the house, therefore have ample opportunity to settle and feed.
Harmful mold infestation occurs whenever too much moisture comes into play; e.g. damp mats in air humidifiers/filters that are not changed regularly, old water in humidifiers; horizontal pipes transporting moist/humidified air are a good habitat for molds if not properly maintained (this also applies to the filters in ventilation systems).

In short, poorly maintained humidifiers and/or ventilation systems with humidification create an ideal moist-warm climate with sufficient nutrients for molds.

Hello Tsäme Now we have wonderfully cold and dry air outside? Does that bother anyone? No, we can now breathe wonderfully? And when we go into our houses, do we breathe worse again? (dry?) Do you notice that? Best regards dämmunsinn

I am a supporter of natural methods—ventilation helps best.:)