TM 9-2320-361-20 14-36. SECONDARY HEATER AND DUCT REPLACEMENT (Contd) b. Duct Removal 1. Unbuckle strap (2) and remove duct (4) from strap (2). Remove screw (3) and strap (2) from van wall (1). 2. Unbuckle strap (7) and remove adapter (6). Remove two screws (8), screw (9), strap (7), and deflector (12) from van wall (1). 3. Remove three screws (10) and deflector (12) from van floor (11). 4. Remove clamp (5) and adapter (6) from duct (4). c. Duct Installation 1. Install adapter (6) and clamp (5) on duct (4). 2. Install deflector (12) on van floor (11) with three screws (10). 3. Install strap (7) and deflector (12) on van wall (1) with two screws (8) and screw (9). Buckle strap (7) on adapter (6). 4. Install strap (2) on van wall (1) with screw (3). Buckle strap (2) on duct (4). 14-58