ᐅ Decentralized Ventilation Using Individual Units in a Single-Family Home

Hello,

we are currently in the final planning stages before construction begins.

However, there is one important topic I still need to decide on.

It concerns decentralized ventilation units to be installed in one or two rooms (bathroom and possibly kitchen). I have done some research, and many systems use the push-pull setup, which requires two fans. Since this does not make sense with my floor plan and I don’t want a vent on every wall, I am looking for a unit that can operate independently.

I have come across the following devices:

1. Blauberg Freshpoint-E
2. Blauberg VENTO Expert DUO A30-1

Both units can provide supply and exhaust air with heat recovery.

Does anyone have experience with the manufacturer or these models? Or is there a good/better alternative?

A central ventilation system is not an option for me, as we also like to keep windows open or tilted. However, in my opinion, a fan in the bathroom makes sense due to the occasionally high humidity levels.

Thanks in advance.

Just my two cents:

Your idea is rubbish. New construction = central controlled residential ventilation.
Anything else is objectively not comparable – decentralized only for mining reasons, but then following the DIN ventilation concept everywhere.

If you want to install "only" two fans, please make sure there is a humidity sensor in the bathroom. Otherwise, it doesn’t matter what you install.

Addendum, in case it wasn’t entirely clear:

The fan can be operated as a standalone unit (supply and exhaust air are separated within the fan) and includes heat recovery. Otherwise, I only find fans that either operate solely as exhaust units or are designed to be used in pairs.

Hi,

With the two devices, you’re generally on the right track because they cover exactly what you’re looking for: single-room units with switchable operation and usable heat recovery, without needing a second unit on the opposite side of the room. The crucial factor with such devices is more about how smoothly the control system works and whether the airflow volume makes sense for your room size. In a bathroom, a moderate air volume is often sufficient, but the fan should not constantly switch back and forth between supply and exhaust air when the humidity sensor is a bit “overly sensitive.”

What you should consider: Whether the push-pull option really makes no sense for your layout also depends on whether you have a short, reasonably sound-insulated exterior wall in the bathroom. Have you already calculated the airflow volumes you actually need, or are you currently choosing purely based on the design? Sometimes a single unit is technically more logical; other times, it means unnecessarily compromising performance.

A slightly ironic remark: Many end up buying a high-tech device but then operate it in “windows slightly open all the time” mode. If you like to ventilate this way, that’s perfectly fine, but then the fan must be able to respond properly to variable external conditions. Have you checked whether the models offer a humidity control setting that doesn’t activate too early?

One small spelling mistake for you: If your wall thickness fits, you should also check whether the installation sleeves of the devices transmit unnecessary structure-borne noise.

JuLelle schrieb:

We are currently in the final planning stages before construction begins. However, there is still one important issue I need to decide on. Specifically, it concerns decentralized ventilation units to be installed in one or two rooms (bathroom and possibly the kitchen).

It’s a pity you haven’t shared your planning progress with us so far. What made you decide to install a controlled mechanical ventilation system only in the wet rooms?

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Nauer schrieb:

Hi,

with these two devices, you’re basically on the right track, as they cover exactly what you’re looking for: single-room units with reversible operation and effective heat recovery, without needing a second unit on the opposite side of the room. What really matters with such units is how well the control system works and whether the airflow volume is suitable for your room size. In a bathroom, a moderate airflow is often sufficient, but the fan shouldn’t constantly switch back and forth between supply and exhaust air if the humidity sensor is a bit “overly sensitive.”

Something to consider: whether the push-pull option is really impractical for your floor plan also depends on whether your bathroom has a short, reasonably noise-insulated exterior wall. Have you already calculated the actual airflow volumes you need, or are you currently choosing purely based on the type of system? Sometimes a single unit is more technically sensible, other times it wastes performance unnecessarily.

A slightly ironic remark: many end up buying a high-tech device but then operate it in the “window-ajar all the time” mode. If you like to ventilate that way, that’s perfectly fine, but then the fan needs to be able to regulate properly against varying outdoor conditions. Have you checked whether the models allow you to set a humidity control that does not activate too early?

A small typo for you: if your wall thickness is suitable, you should also check whether the installation sleeves of the devices unnecessarily transmit much structural noise pressure.

Hello Nauer,

thank you for your detailed response. The mentioned fans have a humidity sensor that can be individually adjusted. There is also the option to set up a weekly schedule. Plan B is to integrate the fan into Loxone (which is being installed for shutter control) and create a simple logic rule there.

The fan should only switch on when humidity is too high. The Freshpoint model additionally has a CO2 sensor.

I want to use the fan only as a “backup.” Otherwise, we tend to prefer opening windows.

I haven’t yet considered sizing/performance. First, I need to find a reliable manufacturer with whom someone might already have experience. And the one mentioned above is the only one I found that has two channels in one housing and can operate supply and exhaust air.