Pre-filter or coalescer

A filter arrangement (20) is provided for filtering fluid flow (13) in a turbine inlet system (14). The filter arrangement (20) includes a support structure (50) extending along an elongated axis (36) within the turbine inlet system (14). A pulse or static cartridge filter (30) for filtering a fluid flow is mounted on the support structure (50), with the support structure (50) extending from an end of the cartridge filter (30). A pre-filter (32) for filtering and/or coalescing the fluid flow (13) is provided and is supported by the cartridge filter (30). A method of filtering fluid flow (13) in the turbine inlet system (14) is also provided.