The UT99 AG – part of Storskogen Switzerland AG - develops and produces for more than 50 years high efficiently state-of-the-art oil mist separators for combustion engines, power plants and industry. As a filter specialist we have the Know-How and product range from electrostatic filters for industrial solutions over coalescence filters for combustion engines to centrifugal filters for hydropower plants. The main focus at UT99 is blow-by oil mist separation for engines in off-highway, marine and power plant applications. UT99 AG can look back to field experience of over 15 years and now more than 100,000 delivered oil mist separators for crankcase ventilation for large engines. UT99 AG is the market leader in oil mist separators for crankcase ventilation of gas engines for use in CHP systems with a power output of more than 600 kW. A residual amount of oil well below 1 mg/m³ blow-by can be ensured for the service life of the filter - and this with a very low pressure drop. The product range for combustion engines includes oil mist separators for closed (CCV) and open (OCV) crankcase ventilation. The actual products cover a range from 8,8 cfm (15 m³/h)up to 824 cfm (1.400 m³/h) nominal blow-by volume flow and can be used for engines from 50 kW up 32 MW. The UT99 oil mist separators were developed for the use on gas, diesel, heavy-fuel-oil (HFO) and dual-fuel (DF) engines. Through the use of UT99 oil mist separators emissions and oil consumption can be reduced for all engines. Particularly in relation to the continuously increasing requirements of emission regulations, e.g. EPA Tier IV Final, the use of highly efficient oil mist separators is beneficial. The requirements for crankcase ventilation according to EPA RICE NESHAP are met. For gas engines the engine efficiency can be increased by up to 0.7 percentage points by switching to closed crankcase ventilation.