ᐅ Controlled Residential Ventilation – What Should You Consider When Choosing One?

junge_familie schrieb:
3) What should you pay attention to (supplier, structural features, ???) if it is important not to feel any airflow?

Two key points are crucial:

• Airflow rate per outlet
The airflow rate at each outlet should not exceed 30 m³/h (18 cfm) under design conditions. Consult your planner or engineer for advice on this.

• Type and placement of the outlet
There are diffuser plates and grilles. Especially with grilles, but in my experience also with diffuser plates in workspaces, you can feel airflow directly underneath an outlet. In winter, this air is usually slightly cooler than the room air. Therefore, avoid placing supply air outlets directly above favorite seating areas.

Pressure equalization (doors) generally does not affect drafts unless you are lying or standing right next to the door.

In general, make sure the system is designed and planned according to relevant standards. Communicate your preferences clearly and review the planning critically. Request a proposal and then discuss it here.

Otherwise, as already mentioned, there are plenty of discussions here and elsewhere… (maybe even too many).

@Zaba12
A ventilation technician is planning. This can of course be part of the heating trade.

The pipes can also be installed later on the raw subfloor. However, core drilling will be necessary. It is definitely advisable to coordinate with the shell contractor.

It is optimal when the air outlets are located in the floor and the exhaust vents are in the ceiling.

Mycraft schrieb:
Certainly, coordinating with the shell builder is a good idea.

In my opinion, at a minimum it is necessary to:
- Consider it during the shell construction (ceiling structure and floor build-up, as space height is needed)
- Take it into account in the structural engineering, especially if the option is to embed it in concrete (or not?)
- If the option is to install it "on the raw floor," coordinate with plumbing and electrical trades regarding installation zones (typically ventilation ducts first, followed by other trades) (again, height is required)
- Include it in energy regulation calculations and heating load determination (especially with heat recovery ventilation)
- Coordinate with floor installers and painters when working around valves, etc.; likewise for the facade if another trade is involved
- Define overflow requirements, if applicable, and consider them for interior doors
- Plan for the electrical connection to the central unit (which also requires space)
- Since there are rules for the placement of fresh air inlets and exhaust outlets, controlled residential ventilation should already be incorporated in the design phase

What else?

This is not intended to criticize your statement, but to raise awareness for the questioner, especially if they are working with an inexperienced general contractor/developer. (Our coordination with the painter went wrong...)

Are there any more experiences to share?

So far in this discussion, only mycraft has mentioned 6 years of experience. From the other posts, it is unclear whether they are more theoretical statements or tips based on actual personal experience.

Real-life experience would be very helpful here.

Using natural building materials, such as wood and clay, and planning spacious rooms whenever possible also helps to prevent moisture problems.

Alex85 schrieb:
Where is the mold supposed to come from?
If it has reached the pipe, you’ve got much bigger problems in the house.

Well, since the indoor air is being extracted, all sorts of things can come in—filters or not...