Ariz. Admin. Code § R11-1-1811 – Single shafts used for intake and return | Midpage
R11-1-1811
Ariz. Admin. Code § R11-1-1811
Single shafts used for intake and return
State Mine Inspector
When single shafts are used for intake and return the curtain wall or partition shall be constructed of reinforced concrete or equivalent and provided with pressure relief devices.