| 摘要 |
A filter comprising:
a hollow frame comprising a first face (15), a second face (20) and an interior passageway (25) extending therebetween;
a first screen (45) extending across the passageway at the first face (15);
a first partial-depth, open-cell stabilizer (60) extending across and into the passageway, wherein the stabilizer comprises a matrix formed by a plurality of walls defining a plurality of open cells therebetween,
a second screen (50) extending across the passageway at the second face (20);
a second partial-depth, open-cell stabilizer (65) extending across and into the passageway, wherein the stabilizer comprises a matrix formed by a plurality of walls (80) defining a plurality of open cells (85) therebetween; and
granular filter materials (55) tightly packed within the passageway, between the first screen and the second screen;
wherein the distance between the first screen and the second screen defines the depth of the filter;
wherein the aggregate depth of the first partial-depth, open-cell stabilizer and the second partial-depth, open-cell stabilizer are collectively less than the depth of the filter.
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