VEHICLE COMPARTMENT STRUCTURE
A structure (10) comprising a load or passenger carrying compartment of a vehicle having a ventilating apparatus internal for moving air between a first environment (13) and a second internal environment (14) along an air flow path (15), the air regulating means (11; 12) comprising a rotatable member (16; 17) rotatable by a drive means (35) about an axis (A; B) of rotation, and the member (16; 17) having a plurality of generally axially extending elements (18; 19) which extend generally outwardly of the axis of rotation (A; B) and the elements (18; 19) being spaced from one another by axially extending spaces (S; S') between each pair of the elements, the arrangement being such that as the member (16; 17) is rotated, each of the elements (18; 19), in turn, engages a reaction surface (21; 22) to cause a volume of air to be moved from the first (13) or second (14) environment and be driven into the second (14) or first (13) environment.