Filtration device
First Claim
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1. A filtration device comprising:
- a first filter having in cross-section first and second outer legs and first and second inner legs connected to each other at first ends and connected to the first and second outer legs, respectively, at second ends such that said first filter forms generally the shape of a W wherein the height of the first and second inner legs is less than the height of the first and second outer legs and a space is defined between the first and second outer legs, said first filter including a porous medium adapted to remove particulates from a gas; and
a second filter having first and second legs, the first and second legs contacting the first and second outer legs of said first filter, respectively, at first ends to prevent bypass flow between the first and second legs of said second filter and the first and second outer legs of said first filter, respectively, said second filter being disposed in the space within said first filter, said second filter including a sorbent for removing or rendering innocuous undesirable substances in the gas.
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Abstract
A filtration device has a particulate filter element and a sorbent filter element having different flow properties. When viewed in cross section, the particulate filter element has inner and outer legs that form generally the shape of a W and define a space between the outer legs. The sorbent filter element is disposed in the space within the first filter element.
83 Citations
14 Claims
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1. A filtration device comprising:
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a first filter having in cross-section first and second outer legs and first and second inner legs connected to each other at first ends and connected to the first and second outer legs, respectively, at second ends such that said first filter forms generally the shape of a W wherein the height of the first and second inner legs is less than the height of the first and second outer legs and a space is defined between the first and second outer legs, said first filter including a porous medium adapted to remove particulates from a gas; and a second filter having first and second legs, the first and second legs contacting the first and second outer legs of said first filter, respectively, at first ends to prevent bypass flow between the first and second legs of said second filter and the first and second outer legs of said first filter, respectively, said second filter being disposed in the space within said first filter, said second filter including a sorbent for removing or rendering innocuous undesirable substances in the gas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification