Ventilation Ventilation
- 55Duty to provide adequate ventilation.
- 56Avoidance of danger from gas in waste.
- 57. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
- 58Provisions as to means of ventilation.
- 59Prevention of leakage of air between airways.
- 60. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .