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.