How does an oil mist filter work?

Oil mist filters work by extracting air which is contaminated with oil mist at source. They separate oil mist particles from the air, collect the oil for re-use or disposal and return clean air into the machine shop. The three technologies most commonly used in oil mist filters are centrifugal force, static filter media and electrostatic.

Filtermist manufactures and supplies all three technologies – our experienced team can recommend the most suitable solution based on specific customer requirements. Find out more about our UK manufactured Filtermist FX and S Series oil mist filters, and premium A•mist filters from our Swedish sister company Absolent below.

How S Series & FX Series works

Filtermist oil mist filters are compact, lightweight and can be mounted in a variety of ways offering flexibility to customers. The design is based around a perforated drum with specially designed veins that rotate to draw oil mist into the filter unit at high velocity. Special drum pads assist the coalescing process and filter out stray solid particles.

Centrifugal force pushes oil to the outer case, where it drains back to the machine for reuse or collection, before returning the clean air to the workshop through the top of the unit. Fitted with motors between 0.18kW and 2.2kW, our oil mist filter units are low energy users keeping running costs at a minimum.

For applications that generate smoke or sub-micron particles, afterfilters can be easily retrofitted to the Filtermist unit, using clips to hold it in place over the exhaust end. This combination offers up to 99.95% filtration efficiency.

How A•erity works

The A•erity units use static filter media to extract oil mist. Contaminated air is extracted from the machine tool using an energy saving EC-fan where it will pass through our unique Tilted Filter System (TFS).

Filter cassettes contain media made of aluminium sheeting, designed in a concertina to increase the amount of surface area that the particulates are exposed to. The patented Catch & Release design cleans the air while draining particles. The initial stage separates the larger oil mist particles from the air, before passing through the second and third stage filters to remove the smaller particulates.

The air is then finally processed through the HEPA H13 filter, which guarantees a filtration efficiency of 99.95%. Once filtered, the coolants are returned to the machine and the clean air is pumped back into the workshop.