An air treatment system is described, for a closable room of a vehicle, comprising: an air conditioning device provided with a fan and connectable to the room; an inlet opening for outside air, connected to the air conditioning device; a filtration device for filtering the outside air entering from the inlet opening; a recirculation port; a valve assembly provided with a shutter member, interposed between the inlet opening, the recirculation port and the air conditioning device and movable between a plurality of operating positions, in which it varies the shares of air coming from the inlet opening and the recirculation port; and a control unit to adjust the operating position of the shutter member so as to control the shares of air being drawn from the inlet opening and from the recirculation port and to maintain a predetermined value of overpressure in the room with respect to the outside.

A system for providing filtered air to an enclosed space includes a first air feed pump to pull air from an environment and push pressurized air to the enclosed space, a power source adapted to provide electrical power to the first air feed pump, a first filter media positioned between the first air feed pump and the enclosed space to provide coarse filtration of the pressurized air pumped from the first air feed pump through the first filter media and remove particles that are larger than approximately 5 microns, and a second filter media positioned between the first filter media and the enclosed space to provide fine filtration of the pressurized air pumped from the first filter media through the second filter media and remove particles that are between 1 nanometer and 20 nanometers in size.

An ionization air purification system for the passenger cabin of vehicles, which modifies the degree of ionization by modifying the energy levels applied to an air ionization device having a tubular dielectric member or a planar dielectric member or ionization source proportional to the change in air flow dynamics and air quality. In one embodiment, an ionization air purification system for the passenger cabin of a vehicle is disclosed. The system includes an ionization device for purifying the air prior to entering into the passenger cabin of the vehicle while minimizing the production of ozone as a by-product; and means for modifying the degree of ionization by modifying the energy levels applied to the ionization tube or ionization source proportional to the change in air flow dynamics or air quality.

Cabin air treatment apparatus for an agricultural machine, comprising at least an external air inlet, a filtration system, an HVAC system, and a cabin air supply outlet. The apparatus further comprises a hermetically closed box inside which the HVAC system is housed, the box having a levelling opening for placing the box into communication with a cabin of the agricultural machine to level a pressure inside the box with a pressure inside the cabin. The filtration system comprises a filter for effecting a filtration of at least one among dust, aerosols and vapours, arranged at an external air inlet formed on the box, and an air inlet duct arranged downstream of the filter and provided with a selecting valve having a first outlet connected to the HVAC system, and a second outlet connected to a fan of a condensation system, through a cleaning duct.

A method is provided for regenerating an odor absorbent in a motor vehicle HVAC system. That method includes the step of heating and regenerating the odor absorbent using heat from a heater core of the HVAC system.

Consumed energy and cost relating to control of a carbon dioxide concentration is reduced. Each of CO.sub.2 concentration control systems (100 to 105) includes a measuring unit (20) that measures a CO.sub.2 concentration, a CO.sub.2 absorption unit (30) that has a CO.sub.2 absorption material (31) for absorbing CO.sub.2 at a rate depending on the temperature thereof, and a control unit (10) that controls the temperature of the CO.sub.2 absorption material (31) by using exhaust heat of a power system (40), so as to control a CO.sub.2 absorption rate of the CO.sub.2 absorption material (31).

An apparatus is provided for regenerating an odor absorbent in a motor vehicle HVAC system. That apparatus includes a regeneration blower assembly that is connected between a heater plenum and a fresh air inlet duct of the HVAC system. Air is drawn from the passenger cabin of the motor vehicle through the heater plenum where that air is warmed. The warmed air is directed through the odor absorbent to remove odors and regenerate the odor absorbent. The warm air and the odors entrained therein is discharged through a fresh air inlet of the HVAC system.

A cabin air control system for a vehicle includes an upper housing, a lower housing, a single adsorption unit being configured to adsorb moisture and/or carbon dioxide and/or harmful gas, and a heater being configured to heat air before being delivered to the adsorption unit, and the heated air being used to regenerate the adsorption unit. The adsorption unit extends along an adsorption unit longitudinal axis, and has a hollow encircling-shaped cross-section in a plane perpendicular to the adsorption unit longitudinal axis, with an opening at a top side thereof, and the heater abuts against the adsorption unit and at least partially covers the opening.

The subject of the invention is a motor vehicle heating, ventilation and/or air conditioning installation (1). Said installation (1) comprises a unit (3) housing at least one blower (15) interposed between an upstream volume (16) and a downstream volume (17) which volumes are delimited by the unit (3). The upstream volume (16) houses a mixing chamber (18) provided with a mixing flap (20). The upstream volume (16) houses a filter (23). Said installation (1) is fitted with means (27, 20, 24, 25) for regenerating the filter (23). The means (27, 20, 24, 25, 14) for regenerating the filter (23) comprise an interstitial space (27) linking the upstream volume (16) and the downstream volume (17) which is created between the unit (3) and the blower (15).

A self-cleaning fan assembly is provided that can be used to automatically clean the assembly's heat exchanger or air filter. In use, once the system determines that the heat exchanger/air filter should be cleaned, for example based on the total operational time or the number of use cycles for the system, or based on the air flow passing through the heat exchanger/air filter, the controller temporarily reverses the direction of the fan, thereby reversing the flow of air through the heat exchanger/air filter and forcing out dust, dirt and other debris.