Which pressure switch should be provided for shutting down the controlled residential ventilation?

We have controlled residential ventilation, recirculation, and a room air-independent fireplace. The fireplace seller shifted the decision regarding the pressure monitor to the district chimney sweep. Of course, I wouldn’t need one – that was his statement.

In the tenders regarding electricity, procurement and installation did not want any electrician to take it on, as if it were uncharted territory.

Fortunately, our controlled residential ventilation (Zehnder ComfoAir) has an emergency shutoff, and the chimney sweep had just attended a training course at Zehnder and was aware of this.
Therefore, we do not need a pressure monitor.

I believe the chimney sweep was just as happy about this as we were.

Hello,

we also have a controlled residential ventilation system, a recirculation hood, and a DIBT certified soapstone stove.

When our house construction company raised the topic of pressure monitors, we contacted our district chimney sweep and provided him with all the technical data on the controlled residential ventilation system, recirculation hood, and stove.

He reviewed everything and informed us that we do not need a DDW.

The most important points for him were:

- Stove locks itself
- DIBT certification
- Controlled residential ventilation system set so that there is a slight overpressure inside the house

However, as has already written, there is no guarantee that you won't need to install a DDW if these points are met – the final decision actually lies with the district chimney sweep.

I therefore also recommend involving him early on and getting his decision in writing.

Regards,

Dirk

From a construction engineering perspective, overpressure is actually rather bad – if there is a leak somewhere, moisture is pushed into the insulation. Just BTW....

Thank you, the lively discussion only does not help me for now. Since the oven will come later, I cannot show anything to the chimney sweep yet, so it was first about what I need to prepare for a possibly needed pressure switch.

can you tell me which switch you have?

The P4 standard - but today I would take a version that has an output for a notification.

: You are not entirely wrong with that. However, this is only relevant for a theoretically 100% airtight "box". The minimal "overpressure" also finds the path of least resistance, which, in my opinion, is still the numerous exhaust valves of the controlled residential ventilation system.