An air exhaust device for a vehicle body panel, which can prevent the inflow of noise, dust and exhaust gas while providing a ventilation function for discharging indoor air to the outside and can enhance a stiffness around an aperture, may include a main body plate, a filtering member, and an air exhaust passage. The main body plate is coupled to the vehicle body panel to block the aperture. The filtering member is disposed in a reception part of the main body plate to block foreign substances introduced from the outside and to allow air passing through. The air exhaust passage extends from the reception part to the outside of the vehicle body panel to discharge the air passing through the filtering member to the outside.

Systems and methods for use in a vehicle can involve determining that a plurality of closures of a vehicle have been closed, running an HVAC system in a fresh air mode after determining that the plurality of closures have been closed, and thereafter recirculating air while adding newly filtered air to maintain a positive air pressure level in a passenger cabin of the vehicle. The determining can occur after one or more people enter the vehicle and being driving, and the recirculating and adding can involve activating a recirculation mode and a fresh air mode simultaneously. Adding newly filtered air maintains a positive air pressure level in a passenger cabin, which level can be set based on an amount of leaks, a user setting, a vehicle type and a pollution level. The determining, running, and recirculating and adding can occur again after determining a vehicle closure has been opened.

A selective filtration system for an operator cab attached to an agricultural vehicle. A HVAC unit supplies conditioned air to an operator space selectively from a CAT 4 filter and a CAT 2 filter. A pressurization blower and two way valve controls flow from the CAT 4 filter to the HVAC unit. Control of flow or isolation of the CAT 2 filter is provided by pressure variations within the system. The CAT 4 filter and CAT 2 filter are isolated from the ambient when they are not in use by valves. A calibrated orifice enables positive pressurization to the CAT 2 filter to hold the valves closed.

Cabin air treatment apparatus for an agricultural machine, comprising at least an external air inlet (11, 16), a filtration system (20), an HVAC system (30), and a cabin air supply outlet (40). The apparatus further comprises a hermetically closed box (1) inside which the HVAC system (30) is housed, the box having a levelling opening (60) for placing the box (1) into communication with a cabin (C) of the agricultural machine to level a pressure inside the box (1) with a pressure inside the cabin (C),

wherein said at least one external air inlet comprises a first external air inlet (11) formed on the box (1). The filtration system comprises a first filter (21) for effecting a filtration of at least one among dust, aerosols and vapours, arranged at the first air inlet (11), and a blower (22) for drawing air from the first air inlet (11) and delivering it to the HVAC system (30), said blower being arranged directly connected downstream of the first filter (21) and inside the box (1).

An air filtration system for a passenger compartment of a vehicle includes a HEPA filter for filtering air from an air inlet into filtered air, the HEPA filter including a fine particulate filter and a gas filter, and air passageways formed in the vehicle and configured to convey the air from the air inlet to the HEPA filter, and to convey the filtered air from the HEPA filter to the passenger compartment

A vehicle comprising, a passenger cabin, a door to the passenger cabin, and an air conditioning system is disclosed. The air conditioning system comprise a Peltier device, a blower for directing an airflow over a first side of the Peltier device and ducting for ducting air to the blower, the ducting comprising an inlet located on an underside of the door.

An air filtration system for a passenger compartment of a vehicle comprises: a HEPA filter for filtering air from an air inlet into filtered air, the HEPA filter comprising a fine particulate filter and a gas filter; and air passageways formed in the vehicle and configured to convey the air from the air inlet to the HEPA filter, and to convey the filtered air from the HEPA filter to the passenger compartment

A vehicle cabin filter assembly comprising a filter module and a further filter module positioned downstream of the filter module. Each filter module comprises one or more filter elements. The filter elements of the filter module are pleated at a first pleat pitch and comprise a gas filter element. The filter elements of the further filter module are pleated at a second pleat pitch and comprise a particulate filter element. And the second pleat pitch is smaller than the first pleat pitch.

A ventilation unit for a vehicle air-conditioning device has a filter element, a filter frame, a wall portion, a blower case, and a blower. The filter element is disposed in an air inlet of the vehicle air-conditioning device. The filter frame houses the filter element. The wall portion is provided in a standing position around the filter element housed in the filter frame. The blower case is attached to the filter frame. The filter frame is coupled with the blower case to be drawn out from the blower case together with the filter element in a drawing direction parallel to an upper surface of the filter element. The wall portion is disposed at a location corresponding to at least a rear side of two sides facing each other in the drawing direction and protrudes upward over the upper surface of the filter element.

A utility vehicle, cab ventilation system which includes a fan and a main filter located in the cab roof section with an upstream pre-filter mounted on the exterior of the cab roof. The pre-filter rotates about an axis parallel to air flow and centrifugally forces matter outward, effectively reducing material build up and frequency of service to the main filter within the roof section. The pre-filter can be built into a new cab ventilation system or provided in a module, for adding to existing cab ventilation systems.