TM 10-3930-669-20 b.  Installation. (1) Install   heater   vent   frame   (2)   on   cab   heater housing (4) with four screws (3). (2) Install heater vent (1) on heater vent frame (2). NOTE Follow-on Maintenance: · Close cab door (TM 10-3930-669- 10). · Remove wheel chocks (TM 10- 3930-669-10). END OF TASK 16-41

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