Patent ID: 7946368

Claim:
An agricultural machine, comprising: an internal combustion engine having a crankshaft; an air cleaner system including an air cleaner and an air pre-cleaner coupled to said air cleaner, said air cleaner system being coupled in fluid communication with said internal combustion engine for supplying combustion air to said internal combustion engine, said air pre-cleaner having a first vacuum port; a cooling package in fluid communication with said internal combustion engine, said cooling package including a radiator having an air inlet and an air outlet, a rotary screen mounted at said air inlet of said radiator, and a vacuum duct having a vacuum opening and a second vacuum port, said vacuum opening of said vacuum duct being positioned adjacent said rotary screen; and a fan unit coupled in fluid communication with said air pre-cleaner and said cooling package, said fan unit including: a fan housing configured to define a plurality of fan chambers, each fan chamber of said plurality of fan chambers having a respective air inlet port and a respective air outlet port, wherein a first air inlet port of a first fan chamber of said plurality of fan chambers is connected in fluid communication with said first vacuum port of said air pre-cleaner, and wherein a second air inlet port of a second fan chamber of said plurality of fan chambers is connected in fluid communication with said second vacuum port of said cooling package; a shaft rotatably mounted to said fan housing, said shaft being rotatably coupled to said crankshaft of said internal combustion engine; and a plurality of fans attached to said shaft for rotation with said shaft, wherein a first fan of said plurality of fans is located in said first fan chamber and a second fan of said plurality of fans is located in said second fan chamber.