Abstract: An agricultural vehicle has an operator environment with a roof portion, and an air treatment apparatus installed within the roof portion. The air treatment apparatus includes a vehicle HVAC system having an inlet plenum, other HVAC components and an outlet to the operator environment. The air treatment apparatus further includes an air filtration system having at least one external inlet and first and second filtration devices located between the external inlet and the HVAC inlet plenum. The roof portion is a hollow structure having upper and lower surfaces and front, rear, left and right sidewalls, and the first and second air filtration devices are disposed along one of the left and right sidewalls within the hollow structure of the roof portion. The HVAC system is preferably disposed along the rear sidewall within the hollow structure of the roof portion.

Abstract: An air treatment apparatus for an operator environment of an agricultural vehicle in which air to be filtered is drawn into an air filtration system, filtered and directed to an agricultural vehicle HVAC system. The air filtration system includes first and second filtration devices having respectively coarser and finer levels of filtration. Each filtration device is provided with a respective bypass permanently connected with an inlet end downstream of a valve mechanism that selects between the filtration devices, and an outlet end upstream of the valve mechanism and adjacent the respective filtration device. In use a portion of air flow downstream of the valve mechanism may be recirculated to purge the respective filtration device, and each bypass includes a respective non-return valve opposing transit of air from the outlet to the inlet ends.

Abstract: An air filtration system for an operator environment of an agricultural vehicle including at least one external inlet, a first filtration device having a coarser level of filtration located between the external inlet and an HVAC system, a second filtration device having a second finer level of filtration and an associated blower located between the external inlet and the HVAC system where the air filtration system selectively connects either the first filtration device to the HVAC system blower or the second filtration device and its associated blower to the HVAC system blower and a bypass permanently connects the HVAC system blower and the second filtration device.

Abstract: An air treatment apparatus for an operator environment of an agricultural vehicle in which air to be filtered is drawn into an air filtration system, filtered and directed to an agricultural vehicle HVAC system. The air filtration system includes first and second filtration devices having respectively coarser and finer levels of filtration. Each filtration device is provided with a respective bypass permanently connected with an inlet end downstream of a valve mechanism that selects between the filtration devices, and an outlet end upstream of the valve mechanism and adjacent the respective filtration device. In use a portion of air flow downstream of the valve mechanism may be recirculated to purge the respective filtration device, and each bypass includes a respective non-return valve opposing transit of air from the outlet to the inlet ends.

Abstract: An agricultural vehicle has an operator environment with a roof portion, and an air treatment apparatus installed within the roof portion. The air treatment apparatus includes a vehicle HVAC system having an inlet plenum, other HVAC components and an outlet to the operator environment. The air treatment apparatus further includes an air filtration system having at least one external inlet and first and second filtration devices located between the external inlet and the HVAC inlet plenum. The roof portion is a hollow structure having upper and lower surfaces and front, rear, left and right sidewalls, and the first and second air filtration devices are disposed along one of the left and right sidewalls within the hollow structure of the roof portion. The HVAC system is preferably disposed along the rear sidewall within the hollow structure of the roof portion.

Abstract: An air filtration system for an operator environment of an agricultural vehicle having at least one external inlet, a first filtration device having a coarser level of filtration located between the external inlet and an HVAC system, a second filtration device having a second finer level of filtration and an associated blower located between the external inlet and the HVAC system 4, where the system selectively connects either the first filtration device to the HVAC system blower or the second filtration device and its associated blower to the HVAC system blower and includes a bypass permanently connecting the HVAC system blower and the second filtration device.

Abstract: An air filtration system for an operator environment of an agricultural vehicle including at least one external inlet, a first filtration device having a coarser level of filtration located between the external inlet and an HVAC system, a second filtration device having a second finer level of filtration and an associated blower located between the external inlet and the HVAC system, where the air filtration system selectively connects either the first filtration device to the HVAC system blower or the second filtration device and its associated blower to the HVAC system blower and a bypass permanently connects the HVAC system blower and the second filtration device.