These are used to remove solid and liquid particles from the gas streams. As the gas enters to inlet chamber of the body gas velocity decreases thus allowing large solid and liquid particles to dropout. Gas with finer liquid particles enters filter elements and flow towards to core of the filter elements. As the gas flow through the torturerous path towards to center many small liquid particles collide with filter fiber and coalesce to form larger particles. Enlarged particles enter to the vane pack chamber where large particles falls to the bottom due to gravity and smaller particles removed by the vane pack.