ᐅ Decentralized ventilation / condensation?

Hello,

I have a question about decentralized ventilation with heat recovery. Suppose I install an approved unit with heat recovery in the bathroom. The exhaust air is discharged outside through a wall outlet.

Wouldn't the moist air that is extracted normally condense inside the duct, causing condensate to run down the exterior cover on the facade?

Does anyone have a decentralized mechanical ventilation system with heat recovery installed in their bathroom? Please let me know if you have ever experienced such issues or how the condensate is managed.

Thank you!

I contacted the manufacturer a week ago. My question was how condensation formation inside the unit’s exhaust duct can be prevented. They even advertise that the unit operates without condensation. Naturally, they don’t explain how this works... unfortunately, no response so far.

Hello,

ato schrieb:
I contacted the manufacturer a week ago. My question was how condensation formation in the appliance’s exhaust duct can be prevented. They even advertise that the device operates without condensation. Of course, they don’t explain how that works... Unfortunately, no response so far.

I have been working successfully for several years with a provider based in Berlin. He writes the following on this topic:

The demand-driven control of exhaust fans was equipped for the first time with a humidity-temperature sensor. This innovative control automatically adjusts the fan speed according to ventilation needs: depending on the relative humidity, the airflow increases or decreases. This ensures that only as much air as necessary and as little as possible is ventilated. The sensor, integrated in the intake area of the exhaust fan, measures the temperature and humidity content of the exhaust air volume. Since the fan is installed in the bathroom or WC, where air conditions differ from living areas, the simultaneous evaluation of temperature and humidity achieves fan control adapted to the indoor air conditions of the living spaces. Therefore, the control takes into account not only the demand in the bathroom but also that of the living areas, effectively protecting against moisture damage and mold formation. The automatic annual timer puts the fan on the lowest setting during summer and reactivates humidity control during transitional periods and winter.

Regards, Bauexperte

Hello construction expert, thank you for your reply! This manufacturer starts with an "L," right? I will check that.
Have a great weekend!

As I understand it, there is usually a kind of "spigot" on the outside of the house, so that the pipe outlet does not end directly at the façade but hangs a short distance away in the air. Due to a corresponding edge, any condensate (which physically should occur with every decentralized ventilation system with heat recovery) then drips downward slightly away from the façade. The wind generally also does not press the droplets against the house wall, as it naturally has to turn just before reaching the wall.

Hello,

ato schrieb:
Hello Bauexperte, thanks for the reply! Does this manufacturer start with an "L"? I’ll check that out.
Wishing you a nice weekend!

Yes

Wishing you a pleasant and hopefully sunny weekend as well!