Patent ID: 8272932

Claim:
A ventilation system for a cab of an agricultural machine having a agricultural chemical sprayer mounted exteriorly of the cab and which agricultural sprayer is operatively controlled by a person within the cab, the ventilation system comprising: at least one outside air intake; at least one air outlet opening out into the cab; means for causing incoming air coming from the outside air intake to flow through the at least one air outlet and into the cab; a first closure means for selectively opening and closing said outside air intake; and control means mounted within the cab and being operably connected to the agricultural sprayer for controlling the agricultural sprayer to activate spraying and to deactivate spraying; filter means for filtering the incoming air; the control means also being connected to the first closure means in such a manner that the first closure means closes the at least one outside air intake to prevent chemicals from entering into the cab in response to the control means activating the agricultural sprayer to begin spraying and such that the first closure means opens the at least one outside air intake to allow outside air to enter the cab in response to the control means deactivating the agricultural sprayer to stop spraying.