Filler Breathers@ are mounted on the oil tank and prevent the entry of dirt from the surroundings during tank breathing. They should be chosen with a filter unit that is similar to the working filter (Pressure Filter, Return-Line Filter).
The replacement cycles of filter inserts is highly dependent on the surrounding conditions of the hydraulic system.
Another variant of the breather is the Desiccant Air Breather (j) . The additional function of this filter is dehumidification of the inflowing air with a special silicate gel.