1. Checked plastic tubing for snug fit on battery box inlet-outlet. 3/8" seems best. 2. located positon for inlet hole. 3. Drilled pilot hole with #40 bit. 4. Selectred grommet for snug fit with tubing. 5. Checked mounting hole size on grommet with calipers. 6. Opened pilot hole with variable size bit. 7. Cleaned hole and installed grommet. 8. Slipped tubing over inlet on battery box, and through hole. 9. Cut tubing on bottom of aircraft facing forward, to foce air in. 10. Repeated steps 2,3,6, and 7 for outlet hole. 11. Slipped tubing over outlet on battery box, and through hole. 12. Cut tubing on bottom of aircraft facing aft, to pull exhaust fumes out. 13. Cleaned area of metal chips, etc.
