Electric heating device and leads to the circulation of air in an installation for heating, ventilating and / or air conditioning unit

摘要

The invention relates to an air circulation device of a ventilation, heating and/or air-conditioning system, which duct is designed to receive an additional electric heating device (4) arranged cross-wise to an air flow in the duct. The duct (6) comprises a projecting indexing element (22) arranged such that it projects from an inner surface (18) of a part of the wall (16) of the duct opposite the opening and designed to engage a recessed indexing element arranged on a connection interface of the additional heating device. The invention further relates to the device associated with the duct and to the ventilation, heating and/or air-conditioning system formed thereby.