Patent ID: 8561740

Claim:
An HVAC system for a work vehicle having an operator cab comprising: a first chamber having an inlet for receiving a flow of air exterior of the cab and an outlet, the inlet adjacent to a first source for moving air for use independent of the HVAC system, the inlet arranged to cause a first change of direction of airflow inside the first chamber, the first chamber resulting in both a first air pressure reduction and a first reduction of airflow velocity while inside the first chamber sufficient to reduce an amount of particles entrained in the airflow while the particles are within the first chamber; a conduit in fluid communication between the outlet of the first chamber and an inlet of a second chamber, the second chamber configured to cause both a second change of direction and a third change of direction of airflow while inside of the second chamber; a third chamber configured to receive airflow from an outlet of the second chamber and to receive recirculated air from within the cab, the recirculated air brought into selective thermal heat exchange with a heat exchanger of the HVAC system by a second source for moving air, the recirculated air then entering the third chamber via an opening formed in the third chamber, the recirculated air and the airflow entering the third chamber from the second chamber mixing together; and a filter positioned interior of the cab and in fluid communication with the third chamber to remove at least a portion of remaining particles entrained in the mixed airflow.