A coating installation includes at least one recipient which can be evacuated and which is provided to receive a substrate, at least one gas supply device which can introduce at least one gaseous precursor into the recipient, and at least one activation device which contains at least one heatable activation element, the end thereof being secured to a securing point on a support element. A shielding element which can protect at least the securing point at least partially against the effect of the gaseous precursor is provided. The shielding element has a longitudinal extension having a first side and a second side, the first side being arranged on the support element and a locking element being arranged on the second side of the shielding element, the locking element having at least one outlet. At least one separation wall is arranged inside the shielding element, the wall separating the inner volume of the shielding element into a first partial volume and into a second partial volume.