Floor duct. Lower. A nozzle / vent to direct HVAC Air to the vehicle's windshield of to defrost / defog the windshield. HVAC Air Distribution Ducts located under the dashboard. HVAC Duct Adapter. Elbow. Floor. Grille. Heater. Hose. Housing. HVAC Adapter. Instrument Panel. Outlet. Windshield Defogger Vent. Windshield Defroster Nozzle.