A complete line of single-temperature units for long haul and delivery applications. Developed to achieve Evergreen CARB and EPA emissions compliance while adding performance, the Precedent S-Series is notable for what it does not have: a Diesel Particulate Filter (DPF). The pallet in the back of the trailer is just as important as the one in the front. Trust Thermo King's AirFlow to keep all of your cargo at the right temperature.