Pennsylvania Code
Title 25 - ENVIRONMENTAL PROTECTION
Part I - Department of Environmental Protection
Subpart D - Environmental Health and Safety
Article IV - Occupational Health and Safety
Chapter 207 - NONCOAL UNDERGROUND MINES
Subchapter C - MINED-OUT AREAS
SPECIFICATIONS
Section 207.314 - Ventilation

(a) General requirement. The owner or operator of a developed facility shall ensure that an adequate supply of pure air is provided and maintained in the developed facility as provided in subsection (c). If the Department or the operator determines it is necessary to install mechanical means of ventilation, these mechanical means for providing pure air shall be approved by the Department in writing before the mechanical ventilation system is operated.

(b) Ventilation system requirements. The owner or operator of the developed facility shall submit to the Department drawings depicting the proposed ventilation system. One or more inspections of the developed facility may be part of the Department's review of the proposed mechanical ventilation system. Any Department approval may include conditions necessary to ensure the ventilation system is providing pure air to all portions of the developed facility.

(c) Quantity of air. A minimum of 20 cubic feet of outside air shall be supplied to every occupied or enclosed space in a developed area, per minute, per person present in that area.