TM 10-6640-215-13 4-13. REMOVE/INSTALL PROPANE LOCKER VENTS- continued. INSTALLATION Install Propane Locker Vents..  See figure 4-3. a. Place propane locker vents into openings of semi-trailer van. b. Secure propane locker vents to semi-trailer van with eight rivets. 4-14. REMOVE/INSTALL FUME CHAMBER AND GUM BATH VENT EXHAUST DOOR ASSEMBLY. This task covers:   a. Removal b. Installation c. Installation INITIAL SETUP: Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 2) Portable Electric Drill, (Appendix B, Section III, Item 1) Twist Drill Set, (Appendix B, Section III, Item 1) Hand Blind Riveter, (Appendix B, Section III, Item 3) Materials/Parts Required Filter, (Appendix F) Rivets, (Appendix F) Gaskets, (Appendix F) REMOVAL Remove Door Assembly.  See figure 4-4. a. Remove eight screws, lockwashers, and flat washers from filter. b. Remove filter from vent box. c. Remove four screws, lockwashers, and flat washers that secure the two damper frames to vent box. d. Remove twenty-one rivets that secure door assembly and vent box to semi-trailer van. e. Remove door assembly, gasket, and vent box from semi-trailer van. REPAIR 1. Repair Latches..  See figure 4-4. a. Remove two screws, flat washers, and wave washers from each latch. 4-28