Decentralized ventilation system that is hardly visible on the exterior facade

I know that some general contractors shy away from this because it is a bit more complex during the construction phase, especially regarding the planning.

Where it seems possible to them, general contractors fundamentally avoid detailed planning. Decentralized, holes are made in the exterior walls; for the HVAC installer, this is just a side task. Centrally, you would have to "involve" them when the "filigree ceiling" (R) is completed. Because: "central" means the whole building is penetrated in three dimensions and comprehensively cross-trade by the system as a complex installation object. That is a completely different world. Simply put: centrally, the Earth is a sphere, and decentralized only a disk. This significantly enlarges the choice of subcontractors capable of the task, affects decisively fewer components (points of complication), and is correspondingly more flexible to integrate into the workflows. General contractors earn their money by producing enclosed space on a piecework basis. The decentralized devices can use the same screed Ahmeds who also box in the downpipes, foam the windows, and point the bricks. That counts. My conclusion (and as always, you may love or hate me for it being subjective): in architect-designed and -construction-managed houses, you have the choice; in design-assistant-planned general contractor construction, it significantly increases the number of advisable expert site visits if you still want to try the central variant. Note: General contractors with their own heating/climate ventilation builders are rather rare, and decentralized controlled residential ventilation affects more components, also from the classical general contractor core area (mason and concrete worker or carpenter work). So it is usually already, as a trade, a general contractor subcontractor interface.

Fortunately, the myth of dirty pipes is now heard only very rarely, from the attic.

Anyone who believes in the myth of the myth talks too seldom with beverage system cleaners.

The myth of dirty pipes is fortunately heard only very rarely nowadays, from the old chest..

..and in the VDI guideline 6022 on the topic of ventilation systems, hygiene, and building technology. It is not without reason that an annual maintenance of all pipes is recommended if "persons stay in the rooms for more than 30 days per year as intended." That should apply in a residential building. By the way, for decentralized ventilation systems, a semi-annual filter change is recommended. That manufacturers take a different position on the topic than the VDI is understandable from a sales perspective. Surely ventilation systems have comfort advantages – I gladly do without them.

..and in the VDI guideline 6022 on the topic of ventilation systems, hygiene, and building technology. It is not for nothing that an annual maintenance of all pipes is recommended when "persons are present in the rooms according to the intended use for more than 30 days per year." This should apply to a residential building. By the way, a semi-annual filter change is recommended for decentralized ventilation systems. That manufacturers position themselves differently on this topic than the VDI is understandable from a sales perspective. Surely ventilation systems have comfort advantages - I gladly do without them.

Can you provide more details on that? And recommendations are, of course, a tricky matter, as home builders know all too well. But if anyone has concerns, there are plenty of systems that can be cleaned by oneself. Otherwise, just have someone come every 5 years; that should not play a big role within the framework of property maintenance.

Can you provide more details on that?

The reference to the VDI guideline 6022 is quite precise.

But for those who have concerns, there are enough systems that you can clean yourself.

The concerns may be easy to clean, but the pipe systems less so. I’d say physics meets colonoscopy ;-)

The concerns may be easy to clean, but the pipe systems less so. I’d say physics meets colonoscopy ;-)

What do you mean? What does that have to do with physics? Otherwise, I don’t find anything about single-family houses in the VDI guideline; I think it’s more about large industrial plants, which have entirely different requirements.