Stack filter assembly

There is disclosed a filtering apparatus and related method for use eg. in separating fine mist particles from a gas. "Fibre/candle filters" consisting of a fibrous filter bed packed into an annular space between two concentric mesh or open-work cylinders are known. Gas(es) pass along the cylinders either up or down and either from inside to outside. A problem exists with such filters namely a tendency to flood or over-saturate. The invention therefore provides a filter apparatus (5) for separating mist or liquid particles from a gas, comprising at least first and second fibrous filter beds (15) packed into an annular space (20) between first and second substantially concentric mesh or open-work tubular structures (25,30), at least one substantially annular member (35) being provided between each adjacent fibrous filter bed (15).