초록 ▼

Constructions and methods are described for collecting particulate material from gas streams. In one specifically described arrangement, a region of depth media is oriented upstream of a second region of depth media. A surface loading media is positioned downstream from the second region of depth me

Constructions and methods are described for collecting particulate material from gas streams. In one specifically described arrangement, a region of depth media is oriented upstream of a second region of depth media. A surface loading media is positioned downstream from the second region of depth media. In an alternate embodiment, a further region of filter media is positioned downstream from the surface loading media.

대표청구항 ▼

[ What is claimed is:] [1.] A filter construction comprising:(a) first and second end caps;(b) a first cylindrical region of depth media comprising fibrous media having a first percent solidity: said first percent solidity comprising a percent solidity of the media as it is positioned within said fi

[ What is claimed is:] [1.] A filter construction comprising:(a) first and second end caps;(b) a first cylindrical region of depth media comprising fibrous media having a first percent solidity: said first percent solidity comprising a percent solidity of the media as it is positioned within said filter construction; and, said first percent solidity having a value of no greater than about 3%;(i) said first cylindrical region of depth media being embedded in, and extending between, said first and second end caps;(c) a second cylindrical region of depth media;(i) said second cylindrical region of depth media being positioned downstream from said first cylindrical region of depth media;(ii) said second cylindrical region of depth media comprising fibrous media of greater percent solidity, within said filter construction, than said first percent solidity;(iii) said second cylindrical region of depth media being embedded in, and extending between, said first and second end caps;(d) a cylindrical pleated filter positioned downstream from said second cylindrical region of depth media;(i) said cylindrical pleated filter being embedded in, and extending between, said first and second end caps;(e) an outer, cylindrical, liner embedded in, and extending between, said first and second end caps;(i) said outer liner being positioned upstream from said first cylindrical region of depth media; and(f) an inner liner embedded in, and extending between, said first and second end caps;(i) said inner liner including at least a portion thereof positioned downstream from said cylindrical pleated filter.