According to company officials, the component is one of several design modifications Strata is making to the unit’s design to meet MSHA’s regulations for chambers outlined in Part 7 of Title 30, Code of Federal Regulations.

The newly approved breathable air component is part of the breathing air system that comes as standard in all of Strata’s Fresh Air Bays.

It provides chamber occupants with the required 96 hours of breathable air in the event of an emergency that prevents escape.

Georgia-based Strata produces both steel and inflatable mine refuge chambers.

The Fresh Air Bay is an inflatable model.