A MineARC Refuge is fitted with three (3) separate air/oxygen supply systems. Should one supply fail or become exhausted, the next supply takes over:

1. Filtered and Silenced Compressed Air Supply ('Mine Air').
Under normal circumstances a MineARC Refuge will be fitted to a mine's 'mains' air supply - providing a continuous supply of oxygen (O2) and automatically flushing the refuge of any build-up in CO/CO2 generated by the occupant's normal breathing activity. The refuge is sealed air tight to achieve positive internal pressure, hence 'old' air continuously exits via vents at the front of the refuge.

The refuge is fitted for receiving mine air with the following components:
1" Pre Filter with Auto Drain; 1" Coalescing Filter with Auto Drain; 1" Absorption Filter with Auto Drain; Regulator and Silencer

2. Medical Grade Oxygen Cylinders
Should mine air fail, the CO/CO2 scrubbing system will require activating and medical grade compressed oxygen (supplied in high pressure metal cylinders), are on hand to continue providing a steady supply of O2 to the refuge. Fitted with a standard regulator, the cylinder outputs can be adjusted to suit entrapment time and number of occupants.

3. Oxygen Candle
Most MineARC Refuge models are fitted with O2 candles as standard. Should all O2 cylinders become exhausted, each O2 candle will provide a minimum of 6 additional hours supply, based on a fully occupied 20 person refuge (the lower the occupancy, the greater supply and hence longer safe entrapment time). The candle is a solid block of chlorate chemical mixture, which upon ignition, produces high purity O2 in a controlled manner. They are commonly used in submarines, aerospace systems, personnel shelters and other safe havens. They have long shelf lives, occupy minimal space and require no maintenance. They are also safer in confined spaces than liquid or compressed O2.