Home > Kenworth HVAC Box > (Mid-2014 & Newer Sleeper Cabs) Plug & Play Kenworth Heater Box

(Mid-2014 & Newer Sleeper Cabs) Plug & Play Kenworth Heater Box


Elevate your Kenworth’s HVAC performance with our premium stainless steel box assembly, seamlessly replacing OEM part numbers F31-1221-11120. Tailored for mid-2014 and newer W900, T800, T600, C500 models trucks with a sleeper cab.

Utilize our selection tool for an exact fit. Ensure a rust-free future and a hassle-free installation. Experience enhanced airflow with our advanced unit. Fully assembled and prepared for mounting, it’s the HVAC upgrade your system deserves. For inquiries or to kickstart your upgrade, reach out to us at (616) 834-1503.

SKU: F31-1221-20SS-3


  • Evaporator
  • Heater Core
  • Blower Motor
  • Expansion Valve
  • Thermostatic Switch
  • Receiver Drier
  • 2 Hard Steel Lines
  • Electronic Operated Door Actuator
  • Gaskets
  • Fresh air intake and door weldment
  • Stainless fasteners

Our boxes are built with 18 gauge 304 stainless steel. Unlike most aftermarket competitors, we spot weld our boxes for added strength. We offer free shipping in the lower 48 states and Canada.

Cross references: F31-1221-11120

Additional information

Weight 52 lbs
Dimensions 25 × 25 × 21 in


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