Controlled residential ventilation - What should be considered when purchasing?

Yes, sure. What I meant: Hopefully, the airflow of the Proxon is significantly higher than that of the usual [Kontrollierte-Wohnraumlüftung]!

Yes, of course, otherwise the system wouldn’t have any effect at all.

I was last weekend in the neighboring house without a ventilation system. In short: I’m glad to have one

Well, that’s what I always tell new homeowners or experience firsthand with friends and relatives. But every second person pounds their chest angrily and says the air so thick you can cut it in the house has to be that way.

Controlled ventilation has existed for decades (especially in commercial and office buildings). In single-family homes, it has increased since the advent of passive houses (> 10 years?).

That may be true, but it does not change anything about CO2 and other gases, whose levels are permanently kept in a favorable range with controlled residential ventilation, completely automatically.

And has anyone ever inspected the pipes from the inside after more than 10 years (considering that you wouldn't want to remove your pipes again after 10 years)? I have heard of various poor and very poor results in this regard, but I cannot assess whether something or what was neglected in these cases, which is why I want to be cautious with any judgment. Nevertheless, these examples discourage me as long as I do not also hear about positive results. So far, I know the positive values only from theoretical considerations and assumptions.

My brother has had his system for 12 years and everything in the pipes is OK, the system has been operated exclusively with the exhaust filters on the ceiling extraction valves. Often such systems are operated without exhaust filters, then it is normal for the pipes to get dirty.

…I have heard of various bad and very bad results in this regard, but I cannot assess whether something or what was neglected in these cases, which is why I want to be cautious with an evaluation. Nevertheless, these examples put me off as long as I do not also hear of positive results.….

From which sources does this hearsay come?

What about your wastewater outlet, for example in the bathroom? Or in the kitchen? Does that put you off or not? No? Why not? What about the household waste that stays in the kitchen for several days? The toilet? Have you ever thought about legionella? Do you have a water container somewhere, e.g. KVA or water filter? Entrance area: dirt from outside. Fake money... What about the potting soil of your plants?

I will leave out electrosmog... positive results certainly only exist if you can also eat the food you heated in the microwave warm.

Yes, what can be simply sucked in from outside? The exhaust gases of your running engine? Or just the smell of horse manure nearby (one reason people move to the countryside), but that can really be annoying... [emoji6] I do not want to defend controlled residential ventilation, but still want to open eyes on the topic of civilization

@ ypg

Wow! What you can put under the keyword Controlled Residential Ventilation ... Even though some things are still missing

Hey, relax Everything's great with me. And great air without long pipes

@ everyone interested in factual information: They definitely exist -- the dirty ventilation pipes. One of my sources is professionally occasionally involved in renewing or dismantling ventilation pipes. I myself almost once purchased a property with an existing central ventilation system ...

This by no means (!) means that all ventilation pipes have to be contaminated or dirty. Good filters achieve a lot. And a lot has happened in recent years in the private sector, especially regarding filtering. Healthy skepticism should accompany the pros and cons of all installations in advance. There are different ventilation concepts and every family should choose the one that best suits them and the property.

I have also decided on a controlled residential ventilation system in my house, which is yet to be built. Can anyone share experience regarding the following question:

Typically, the supply air is in the bedroom, and the exhaust air is in the bathroom next door. The bedroom is usually around 18 degrees, the bathroom around 23 degrees --> Is this even possible, or does the bedroom cool the bathroom down or heat it up? Can rooms actually have temperature differences?

When standing wet and naked in the bathroom: is there a draft to be felt? I have also read that some have had a flap installed that temporarily blocks the exhaust air in the bathroom.