Extraction air treatment system (1), in particular for large kitchens, with at least one part (2) of support and with at least one part (3) of detachable housing that is arranged or that can be arranged in the part (2) of support, part (3) of housing that during the service of the extraction air treatment system (1) is crossed or can be crossed by extraction air, and part (3) of housing in which it is arranged at least one UV unit (4) by means of which electromagnetic radiation in the UV range can be applied to the extraction air, with at least one device (2) and in the housing part (3) being provided together. 5) electrical contact, characterized in that the electrical contact device (5) includes: a first contact support (6) with a first amount of first contact elements (7)； a second contact support (8) with a second number of second contact elements (9)； and a spring force device (10) that is configured to act on the second contact support (8)； at least a partial amount of the first contact elements (7) or the second contact elements (9) being arranged such that they are in contact or can be brought into conductive contact of electricity in pairs in each case together with a contact element of the other contact support for, in a connected state of the contact device, to form pairs of contact elements； the first contact elements (7) or the second contact elements (9) being configured as spring contacts, whose tips, at least in an unconnected state of the contact device (5), protrude to an excessive extent (UM ) above a surface (6a) of the corresponding contact support (6), surface (6a) that is oriented towards the other contact support (8), at least in the connected state； being applied or can be applied by the spring force device (10) a spring force (F) on the second contact support (8) in the direction of the first contact support (6) when said pairs of elements are formed Contact； the first contact support (6) being essentially non-movable in a first support dev
