Kenworth and PeterBilt HVAC & Heater Boxes › OEM Kenworth Fresh air Duct (Part #'s 601023,601063) Image 1 of 2 Image 2 of 2 OEM Kenworth Fresh air Duct (Part #'s 601023,601063) CA$475.00 Factory Replacement Part, Compatible with OEM Heater Boxes and our Soaring Eagle Heater Boxes Model Year: Select Model Year 2001 or Newer W900 - T800- T600 1987-2000 W900 - T800 - T600 Quantity: Purchase Added! Factory Replacement Part, Compatible with OEM Heater Boxes and our Soaring Eagle Heater Boxes Reviews Reviewer Name Review Date Star Rating Description Posted on Etsy Product Show More You Might Also Like OEM Kenworth HVAC Clip (Part# 601069) CA$4.50 Replacement Kenworth AC Evaporator 1987-2014 CA$425.00 OEM Style Stainless Steel Duct Flap Assembly CA$125.00 Standard Pad Mount Expansion Valve 99-07 (601004) CA$80.00 Rubber Recirculation Flap For Kenworth Heater Box CA$25.00