Ozvent Consulting - Underground Metalliferous Mine Ventilation Engineering Consultants. Services include: Underground ventilation and cooling/ heating design, specifications and testing. Consultants include Andrew Derrington and Brendan Clarke - both mining engineers with over 30 year's experience each. Specialties include all forms of caving mines, ore handling system ventilation, uranium mine ventilation, deep mechanised mine ventilation and cooling and general mine ventilation problem solving.