Controlled residential ventilation system - decision support

The crucial factor is the planned air volume per outlet (i.e., m³/h per outlet). This allows considerations regarding flow velocities and pressure loss to be made (depending on the pipe used and the type of valve). Low velocities and low pressure loss should be aimed for.

If a good planner is found, "erhöhte Schallschutzanforderungen" could be agreed upon and then let the planner do their work.

In the design case, we have 35 m³/h through a floor outlet in the bedroom, which I do not at all find disturbing. If I could plan completely freely, I would probably aim for no more than 30 m³/h. But—as mentioned above—it depends.

Our GÜ said upon our inquiry that including the basement in the controlled residential ventilation (until now only the ground floor and upper floor, as already mentioned) would be disproportionately expensive.

Do you have any experience with what additional effort might be required for the basement? From my point of view, I would spontaneously say that ventilating the basement should be significantly cheaper, since the pipes wouldn't have to be that long and the system is already fully installed anyway? What do you think about the costs?

Then simply award the contract to another ventilation installer, talk to the Keller... it should then be manageable with a maximum of 1K euros extra...

We paid about €500 for the ventilation of an additional bathroom in the basement.

What actually drives the price of such a system (e.g. )? It’s not the device itself, a floor for 1,000€ ... it’s not that either. So how do system prices of 10-13,000€ come about? Floor outlets seem to me to be more expensive purely in terms of material (nice grilles etc.) than ceiling outlets. On the other hand, ceiling outlets require longer pipes in the case of the upper floor...

It is, as so often, the work, both the planning and then the execution on site.

Laying the channels takes significantly longer if an entire floor is added... walls and ceilings will then most likely have to be broken through, meaning for the GÜ either core drilling or deviations from the standard plan and new plans for the concrete factory.

Additionally, everything will probably have to be larger, i.e. the system and pipes, in order to comply with the air exchange rates.