Filter arrangement including removable filter with first and second media secured together

摘要: A filter arrangement is provided. The generally includes an air (12) having upstream surface (28) with a prefilter (4) positioned thereon. preferably at least two layers of depth media (34, 35). In preferred systems, the secured to one another by stitching (37, 40). certain arrangements disclosed, layer fibrous (34) and downstream foam (35), stitched along peripheral edges. invention also concerns provision prefilters, which include housings filters prefilters according present operably therein. Methods construction use are