TM 10-6640-238-13 4-28 4-14 FUME HOOD AND GUM BATH VENT EXHAUST DOOR ASSEMBLY. This task consists of: a. Remove b. Repair c. Install INITIAL SET-UP Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 1) Portable Electric Drill, (Appendix B, Section III, Item 2) Twist Drill Set, (Appendix, B, Section III, Item 2) Hand Blind Riveter, (Appendix B, Section III, Item 3) Soldering Gun, (Appendix B, Section III, Item 2) Materials/Parts Required Gaskets, (1) Lockwashers, (6) Rivets, (36) Rivnuts (4) Adhesive (Appendix E, Section II, Item 2) REMOVE 1. Remove Door.  See Figure 4-4. a. Remove seven rivets (1) securing door assembly (2) to vent box (3). b. Unlatch and remove door assembly (2). 2. Remove Vent Box and Gasket. a. Remove gasket (4). b. Remove 19 rivets (5), six rivnuts (6) and vent box (3) from Mod Lab A (7). 3. Remove Damper. a. Remove 10 rivets (8) and damper frame (9). REPAIR Repair Door Assembly.  See Figure 4-4. a. Remove screw (10) lockwasher, (11) and washer (12), latch (13), and wave washer (14) from door assembly (2). Discard lockwasher. b Install wave washer (14) and latch (13) and secure with screw (10), lockwasher (11), and washer (12). c. Remove two screws (15), lockwashers (16), washers (17), and latch keeper (18) from spacer (19).  Discard lockwashers. d. Remove two rivnuts (20) and spacer (19). e. Install spacer (19) and secure with two rivnuts (20). f. Install latch keeper (18) to spacer (19) and secure with two screws (15) lockwashers (16), and washers (17). g. Remove two screws (21), nuts (22), lockwashers (23), washers (24), and clamp cover (25). h. Install clamp cover (25) and secure with two screws (21), washers (24), lockwashers (23), and nuts (22).