Abstract: A natural air ventilation system for vehicle cabin comprising a scoop provided to a front side of the cabin and one or more air ducts connected to said scoop to allow outside air into the cabin, an exit vent at the rear wall of the said cabin, the exit vent of rear wall connected by duct means to a snorkel having a matching vent to form tight air passage, the snorkel outlet is connected to an intake manifold of an engine through an air fitter such that when the engine is running intake air to said manifold includes a portion of air of cabin space through the said exit vent of cabin and a portion of outside air through an opening on the snorkel.

Abstract: Local areas of a visualized modeling language diagram are viewable at different levels of detail without losing information such as model elements and their connectivity. Multiple elements are associated with a group element, which has a visual portion derived from the appearance of a group member element. Connectors between group member elements and non-member elements are suppressed in favor of replacement connectors between the group element and the non-member element(s). The integrity of incoming and outgoing connections to the group is maintained relative to the rest of the model. Ungrouping elements restores the elements to their original state. Grouping can be applied locally to one or more parts of the visual model.