ᐅ Inlet Elements Zuroh 100 / Zuroh 110

Hello everyone, our plumber would like to install supply air units in the 3 bedrooms. The Zuroh 100 or, with a 20€ surcharge, the Zuroh 110, which has an opening lever.
Does anyone know these supply air units? Is the extra cost for the opening lever worth it?

Do you not have a mechanical ventilation system? Or another type of ventilation concept?

No mechanical ventilation system, our mechanical ventilation system is simply opening the window 🙂