1. Mine Fresh Air Base

2. Overview Description of the Fresh Air Base
Functional Descriptions of Equipment
Operations: Controls and Systems

3. Roof in Low Position

4. MSU Transport

5. Interior - Main Chamber

6. Roof Lifting Strut & CO2 Scrubber

7. Freezer Unit
With Cold Air Outlet into Main Chamber

8. Gas Supply G size bottles - 5 in Main and 2 in Entry compartments
Controlled discharge via panels and piping

9. External Air Connection
Air Supply
External Air Connection

10. Air Supply
Entry Compartment
Air Curtain

11. Air Supply
External Air Valve
and Relief System

12. Oxygen Supply
Oxygen Dosing Tank

13. Carbon Dioxide Scrubber Unit
CO2 Scrubber
Carbon Dioxide Scrubber Unit

14. Access
Main, Internal and Emergency Doors
Double Lock Compartment

15. Air Circulation Fan & Control Valve

16. Facilities
Chemical Toilet

17. Facilities
Washbasin

18. System Operations and Checks: CO2 Removal
2 scrubbers powered by on board batteries
24 hour capacity
Canisters requires periodic (approx 2 hrs) change out

19. System Operations and Checks: Electrical System
External 240VAC with single isolator inside compartment
2 internal power outlets (charger + 1 spare)
12VDC float charge to 3 x 102 AH batteries, 24 hour power capacity for fans
Batteries stored on shelf in Entry Compartment

20. System Operations and Checks: Charger & Batteries

21. Current Designs Extend Time to 90 Mandays
Evaluating Alternative Power Units
Increase Pulse Loading

22. Questions