Consistenly high collecting efficiency Longest possible service intervals. The filtered air can often be returned to the premises. The returned oil can be used for recycling. Low noise level Functional description Contaminated air is sucked into the inlet (1) in the lower section of the filter unit and passes through: filter stage 1 (2), where the majority of the the oil particles are trapped. When filter stage 1 unit reaches a state of equilibrium, the oil drops that have been caught drain down into the bottom of the filter, which acts as a collection container and are pumped (8)(accessory) or drained away. The air passes through an additional Absolent filter (3), where remaining particles are filtered out and on via a HEPA filter (4) to the external fan. Generally the air is now so clean it can be returned directly to the premises.		1. Inlet, pipe connection 2. Filter stage 1 3. Filter stage 2 4. Hepa filter 5. Outlet 6. Pressure gauges 7. Control cabinet (not illustrated, accessory) 8. Return oil tank /pump & pump (accessory) 9. Outlet