Abstract: A vent unit includes a bezel installed on a vehicle and formed in a ring shape with a flow hole at the center, and a spacer overlapping and coupled to the bezel and formed in a ring shape rotating relative to the bezel. The bezel has a plurality of first through-holes circumferentially spaced apart from one another, and the spacer has a plurality of second through-holes circumferentially spaced apart from one another such that conditioning air is discharged to an interior through the second through-holes and the first through-holes when the second through-holes are aligned with the first through-holes by circumferential rotation. The vent unit further includes a wing disposed in the flow hole of the bezel and coupled to the spacer through a hinge shaft. The wing controls discharge of conditioning air through the flow hole by axially rotating, and circumferentially relatively rotating together with the spacer.

Abstract: A vent unit includes a bezel installed on a vehicle and formed in a ring shape with a flow hole at the center, and a spacer overlapping and coupled to the bezel and formed in a ring shape rotating relative to the bezel. The bezel has a plurality of first through-holes circumferentially spaced apart from one another, and the spacer has a plurality of second through-holes circumferentially spaced apart from one another such that conditioning air is discharged to an interior through the second through-holes and the first through-holes when the second through-holes are aligned with the first through-holes by circumferential rotation. The vent unit further includes a wing disposed in the flow hole of the bezel and coupled to the spacer through a hinge shaft. The wing controls discharge of conditioning air through the flow hole by axially rotating, and circumferentially relatively rotating together with the spacer.

Abstract: A system for operating a positive temperature coefficient (PTC) heater in a fuel cell vehicle includes a fuel cell stack and a PTC heater generating heat when supplied with an electric current. A controller is configured to check a key-start state of the vehicle and determine whether or not an outdoor temperature is lower than a reference temperature. If it is determined that the vehicle is key-started so as to activate the fuel cell stack, and the outdoor temperature is lower than the reference temperature, the controller supplies electrical energy generated by the fuel cell stack to the PTC heater, thereby driving the PTC heater.