Abstract: A machine includes a chassis, a cab coupled to the chassis, a hood positioned in front of the cab where the chassis and the hood define an internal compartment therebetween, a prime mover positioned within the internal compartment, a cooling pack positioned within the internal compartment, a fan positioned within the internal compartment and configured to drive an airflow through the cooling pack, a first debris shield positioned along a first side of the internal compartment, and a second debris shield positioned along an opposing second side of the internal compartment. Each of the first debris shield and the second debris shield includes a shield body defining a vent, a baffle positioned proximate the vent, and an actuator configured to reposition the baffle from an open orientation to a closed orientation.