TM 10-3930-659-20 16-15.    HEATER VENTILATORS AND DUCT HOSES REPLACEMENT. 6. Loosen two hose clamps (18) and remove duct hose (19) from right duct (12) and louver housing (17). 7. Remove two hose clamps (18) from hose (19). 8. Remove  four  screws  (13),  washers  (14),  left  duct  (16),  right  duct  (12),  and  three  isolators  (11)  from  heater housing (15). TA707012 16-52