Patent ID: 9561702
Date: 2017-02-07
CPC Classifications: B60H

Claim:
1. A heating, ventilation and air conditioning system comprising: a case defining an exterior air intake aperture and an interior air intake aperture; a first door rotatably attached to the case, the first door movable between an open position where the interior air intake aperture is open and a closed position where the interior air intake aperture is closed; and a second door rotatably attached to the case, the second door movable between an open position where the exterior air intake aperture is open and a closed position where the exterior air intake aperture is closed; and a third door rotatably attached to the case, the third door movable between an open position where an air passage between the exterior air intake aperture and the interior air intake aperture is open and a closed position where the air passage is closed; wherein: