a filter comprising a flat sheet , a corrugated sheet adhered in faced relationship to said flat sheet , a first array of parallel spaced orifices formed in said flat sheet , and a second array of parallel spaced orifices formed in said corrugated sheet , orifices in said first array being disposed laterally in spaced relationship from orifices in said second array , orifices in said first array communicating with orifices in said second array through corrugations in said corrugated sheet . a process for separating suspended particles from a fluid using the foregoing filter is disclosed . use of the foregoing filter in a spray booth is also disclosed .