TM 10-3930-659-20 16-5. DEFROSTER BLOWER DUCTS AND DUCT HOSE REPLACEMENT (Con't). 8. If damaged, remove isolator (17) from defroster blower duct (13). 9. Remove two louvers (16) from defroster blower duct (13). b. INSTALLATION NOTE Left and right defroster blower ducts are   Installed   the   same   way.      Left defroster blower duct Is Illustrated. 1. Install two louvers (16) on defroster blower duct (13). 2. If  removed,  apply  adhesive  (Item  1,  Appendix C)    to    isolator    (17)    and    install    isolator    on defroster blower duct (13). 3. Install  defroster  blower  duct  (13)  on  cab  panel (11) with screw (1). 4. Install two washers (15) and screws (14) on defroster blower duct (13). TA706979 16-17