Duct. PartQualifier: upper. upper. W/O R32. 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. Air distributor. Air hose. Cover. Grille. Instrument Panel Air. Intake. Intermed. Piece. Windshield Defogger Vent. Windshield Nozzle.