Apparatus for the heating of plastics material pre-forms with aeration screening capable of being dismantled

An apparatus (1) for the heating of plastics material pre-forms (10) with a conveying device (2) which conveys the plastics material pre-forms (10) along a pre-set conveying path (T), with at least one heating element (4) which is arranged along the conveying path (T) of the plastics material pre-forms (10) and which heats the plastics material pre-forms (10), wherein in addition a cooling device is provided which cools the plastics material pre-forms (10) and/or at least one element of the apparatus (1) during the heating of the plastics material pre-forms (10) by acting upon them with a gaseous medium, wherein a flow path of the gaseous medium is capable of being changed in such a way that in a first pre-set manner it is capable of being conveyed with respect to the outer surface of the plastics material pre-forms (10) during the heating thereof and in a second pre-set manner, which differs from the first pre-set manner, it is capable of being conveyed with respect to the outer surface of the plastics material pre-forms (10), wherein the first and second pre-set manners differ at least with respect to the volume flow arriving at the outer surface of the plastics material pre-forms.