TM 9-2320-209-20-3-4 23-4. FUEL BURNING PERSONNEL HEATER DUCTING REPAIR. TOOLS: Flat-tip screwdriver 3-foot tape measure SUPPLIES: None PERSONNEL: One EQUIPMENT CONDITION: Truck parked, engine off, handbrake set. a. Preliminary Procedure. Open hood and left side panel. Refer to TM 9-2320-209-10. b. Removal. FRAME 1 1. Working from inside cab and using screwdriver, loosen six duct clamps (1). 2. Turn and pull off three diverter ducts (2, 3, and 4) and take off six duct clamps (1). 3. Working in engine compartment and using screwdriver, loosen two heater duct clamps (5). 4. Turn and pull off heater duct (6) and take off two duct clamps (5). END OF TASK 23-4