Abstract: A mechanism for the removal of impurity particles from a gas for cleansing the gas including directing the gas in a circular axial flow through an elongate axially extending circular separator chamber; introducing liquid droplets at the inlet end of the chamber for capturing the particles, passing the droplets through a perforate wall on the chamber into an outer annular wall and removing the liquid from the outer chamber through an air lock valve. In one form the speed of the gas is increased at the location of the droplet introduction by a decrease in the annular size of the chamber, and in another form, the perforate collecting wall is tapered to diminish in size. The size of the chamber is such that the distance from the droplet introduction to the wall is no greater than 25 cm.