Overflow

Whether overflow unit, composite or supplementary ventilator, or inner wall air vent — they all have one thing in common: they are used when an inner room needs to be ventilated via another room. So if a room in an apartment does not have an outer wall, one or more overflow elements can be used to create a connection to other rooms and thus establish an active air connection. For this reason, overflow units are also referred to as supplementary ventilators for the existing ventilation system, enabling cascaded ventilation in a living space.