Air filter assembly with improved liquid drainage

An air filter assembly suitable for use in a gas turbine combustion system, the air filter assembly comprising:

• an air filter comprising a front frame having a front surface defining at least one rectangular aperture for receiving an air flow to be filtered, wherein said air filter is a panel filter, a deep pleat box filter, or a V-type filter, wherein said air filter comprises at least one rectangular pleated filter element, and wherein said air filter conforms to a filtration class from G4 up to H13 according to the standards EN779 or EN1822, and wherein the front surface of the front frame is upstream of the at least one rectangular pleated filter element;
• a deflector element frame extending alongside and in front of the rectangular aperture, the deflector element frame having deflector elements adapted to deflect an air flow passing into the rectangular aperture away from an adjacent inside surface of the air filter;
• and
• a liquid drain arranged between said deflector element frame and the front frame such that liquid collected at the air filter can exit the air filter through said liquid drain and out the front surface between the rectangular aperture and the deflector element frame.