Abstract: A vehicle with a ventilation system that includes a chassis and vehicle body. The vehicle body is mounted on the chassis, and has a floor, a ceiling, a front section, and a back section. The front section includes control instrumentation and an adjacent driver seat. The front section further defines a vent opening and has a duct mounted on the ceiling. The duct extends from the vent opening, and has at least one air portal structured and arranged to direct air over the driver seat. The duct includes a main passage and projections, which are partially defined by sloping walls so as to provide a region of less constrictive air flow as compared to an intake passage. The intake passage extends upward from the vent opening to inhibit moisture from entering the main passage, and the projections and slope of the intake passage serve as a conduit to drain away any moisture that does manage to enter the main passage.

Abstract: A ventilator has incorporated in a main body thereof an air blower having a ventilation casing provided with a fan intake opening facing an intake opening of the main body of the ventilator, the inner side of the main body being opened to form the intake opening thereof. A cylindrical soundproof unit including an inner ventilation passage having a larger ventilation area than a fan intake space and formed of a laminated plate which is formed of a plurality of air layers arranged in a direction intersecting the rotation axis of the air blower from the inner ventilation passage, is disposed in a space between the fan intake opening and the intake opening of the main body. The soundproof unit makes it possible to decrease noise generated by the air blower while the ventilation resistance is hardly increased.