Collapsible extended surface filter and air cleaner system using collapsible extended surface filter

1. A collapsible air cleaner filter comprising:

a collapsible pleated media filter having a first end, a second end, and a filter media extending between the first and second ends, wherein the filter media includes a plurality of pleats having a first plurality of flexible width portions and a second plurality of flexible width portions, the filter media having a width extending between and including the first and second plurality of flexible width portions;

a first end member coupled to and extending along the first end of the collapsible pleated media filter, the first end member having a structural body with a cross sectional shape generally defining at least one outwardly projecting first end foot member, the at least one outwardly projecting first end foot member at least partially defining at least one first end retaining channel, wherein the at least one first end retaining channel is adapted to receive a portion of a first rail provided in a first portion of an air duct; and

a second end member coupled to and extending along the second end of the collapsible pleated media filter, the second end member having a structural body with a cross sectional shape generally defining at least one outwardly projecting second end foot member, the at least one outwardly projecting second end foot member at least partially defining at least one second end retaining channel, wherein the at least one second end retaining channel is adapted to receive a portion of a second rail provided in a second portion of an air duct and wherein the collapsible pleated media filter is adapted to be expanded to an open state by pulling the first and second end members apart to engage the first and second rails.

2. The collapsible air cleaner filter of claim 1 , further comprising at least one first rib extending angularly from the first end member away from the collapsible pleated media filter, and at least one second rib extending angularly from the second end member away from the collapsible pleated media filter.

3. The collapsible air cleaner filter of claim 2 , wherein a portion of the at least one first rib is generally perpendicular to the first end member, and a portion of the at least one second rib is generally perpendicular to the second end member.

4. The collapsible air cleaner filter of claim 2 , wherein the at least one first rib extends generally parallel to the at least one first end foot member, and the at least one second rib extends generally parallel to the at least one second end foot member.

5. The collapsible air cleaner filter of claim 1 , wherein:

the at least one first end foot member includes a first portion provided generally perpendicular to the first end member and a second arcuate portion connected to the first portion, the first portion, second portion, and first end member defining the at least one first end retaining channel; and

the at least one second end foot member includes a third portion provided generally perpendicular to the second end member and a fourth arcuate portion connected to the third portion, the third portion, fourth portion, and second end member defining the at least one second end retaining channel.

6. The collapsible air cleaner filter of claim 1 , further comprising:

a rail assembly for retaining the collapsible pleated media filter within an air duct, the rail assembly including a first rail guide coupled to a first wall of the air duct and a second rail guide coupled to a second wall of the air duct, the first rail guide including a first rail edge, and the second rail guide including a second rail edge, wherein:

the collapsible pleated media filter is retained by the rail assembly such that the first rail edge is received by the at least one first end retaining channel, and the second rail edge is received by the at least one second end retaining channel.

7. The collapsible air cleaner filter of claim 1 , further comprising a rail system provided in a portion of an air duct, the rail system having a first rail guide spatially opposing a second rail guide, the first rail guide having a first rail edge and the second rail guide having a second rail edge, wherein the first rail edge is removably received by the first end retaining channel of the first end foot member and the second rail edge is removably received by the second end retaining channel of the second end foot member such that the collapsible pleated media filter is retained in an extended position between the first and second rail guides.

8. The collapsible air cleaner filter of claim 7 , further comprising an air duct having a first wall, a second wall, an air inlet surface, and an air outlet surface, the first rail guide being coupled to the first wall and provided between the air inlet surface and the air outlet surface, the second rail guide being coupled to the second wall and provided between the air inlet surface and the air outlet surface, wherein the collapsible pleated media filter is provided across the air duct between the air inlet surface and the air outlet surface, forming an effective seal between the first end member and the first wall, and an effective seal between the second end member and the second wall.

9. The collapsible air cleaner filter of claim 8 , further comprising:

a first rib coupled to the first wall and projecting toward the second wall;

a first channel provided on the first rail guide;

a second rib coupled to the second wall and projecting toward the first wall; and

a second channel provided on the second rail guide;

wherein the first channel receives the first rib, forming an effective seal by a tortuous path between the first rail guide and the first wall, and second channel receives the second rib, forming an effective seal by a tortuous path between the second rail guide and the second wall.

10. The collapsible air cleaner filter of claim 8 , wherein the effective seal between the first end member and the first wall of the air duct is formed by a tortuous path between engaged portions of the first end member and the first rail guide, and the effective seal between the second end member and the second wall of the air duct is formed by a tortuous path between engaged portions of the second end member and the second rail guide.

11. The collapsible air cleaner filter of claim 1 , wherein the first and second end members are substantially shape retaining.

12. A collapsible air cleaner filter comprising:

a collapsible pleated media filter having a first end, a second end, and a filter media extending between the first and second ends, wherein the filter media includes a plurality of pleats having a first plurality of flexible width portions and a second plurality of flexible width portions, the filter media having a width extending between and including the first and second plurality of flexible width portions;

a first end member coupled to and extending along the first end of the collapsible pleated media filter, the first end member having a structural body with a cross sectional shape generally defining at least one outwardly extending first end foot member, the at least one first end foot member at least partially defining at least one first end retaining channel;

a second end member coupled to and extending along the second end of the collapsible pleated media filter, the second end member having a structural body with a cross sectional shape generally defining at least one outwardly extending second end foot member, the at least one second end foot member defining at least one second end retaining channel; and

a rail assembly for retaining the collapsible pleated media filter within an air duct, the rail assembly including a first rail guide coupled to a first wall of the air duct and a second rail guide coupled to a second wall of the air duct, the first rail guide including a first rail edge, and the second rail guide including a second rail edge, wherein:

the collapsible pleated media filter is adapted to be expanded to an open state by pulling the first end member relative to the second end member and retained by the rail assembly such that the first rail edge is received by the at least one first end retaining channel, and the second rail edge is received by the at least one second end retaining channel.

13. The collapsible air cleaner filter of claim 12 , further comprising at least one first rib extending angularly from the first end member away from the collapsible pleated media filter, and at least one second rib extending angularly from the second end member away from the collapsible pleated media filter.

14. The collapsible air cleaner filter of claim 13 , wherein a portion of the at least one first rib is generally perpendicular to the first end member, and a portion of the at least one second rib is generally perpendicular to the second end member.

15. The collapsible air cleaner filter of claim 13 , wherein the at least one first rib extends generally parallel to the at least one first end foot member, and the at least one second rib extends generally parallel to the at least one second end foot member.

16. The collapsible air cleaner filter of claim 12 , wherein:

the at least one first end foot member includes a first portion provided generally perpendicular to the first end member and a second arcuate portion connected to the first portion, the first portion, second portion, and first end member defining the at least one first end retaining channel; and

the at least one second end foot member includes a third portion provided generally perpendicular to the second end member and a fourth arcuate portion connected to the third portion, the third portion, fourth portion, and second end member defining the at least one second end retaining channel.

17. A collapsible air cleaner filter comprising:

a collapsible pleated media filter having a first end, a second end, and a filter media extending between the first and second ends, wherein the filter media includes a plurality of pleats having a first plurality of flexible width portions and a second plurality of flexible width portions, the filter media having a width extending between and including the first and second plurality of flexible width portions;

a first end member coupled to and extending along the first end of the collapsible pleated media filter, the first end member having a structural body with a cross sectional shape generally defining an outwardly extending first end foot member and an outwardly extending second end foot member, the first and second end foot members extend angularly from the first end member away from the collapsible pleated media filter, the first end foot member defining a first end retaining channel, and the second end foot member defining a second end retaining channel; and

a second end member coupled to and extending along the second end of the collapsible pleated media filter, the second end member having a structural body with a cross sectional shape generally defining an outwardly extending third end foot member and an outwardly extending fourth end foot member, the third and fourth end foot members extend angularly from the second end member away from the collapsible pleated media filter, the third end foot member defining a third end retaining channel, and the fourth end foot member defining a fourth end retaining channel;

wherein the collapsible pleated media filter is expandable to an open state by pulling the first end member relative to the second end member; and

wherein the first and second retaining channels are adapted to receive a first portion of a rail assembly provided separate from the collapsible air cleaner filter to form an effective seal through a tortuous path between the first end member and the rail assembly, and the third and fourth retaining channels are adapted to receive a second portion of the rail assembly provided separate from the collapsible air cleaner filter to form an effective seal through a tortuous path between the second end member and the rail assembly.

18. The collapsible air cleaner filter of claim 17 , further comprising at least two first ribs extending outwardly from the first end member, the at least two first ribs being provided between the first and second end foot members, and at least two second ribs extending outwardly from the second end member, the at least two second ribs being provided between the third and fourth end foot members.

19. The collapsible air cleaner filter of claim 17 , wherein the first and second end members do not completely overlap the first and second plurality of flexible width portions.

20. The collapsible air cleaner filter of claim 17 , further comprising a rail system separate from the collapsible pleated media filter, the rail system having a first rail guide spatially opposing a second rail guide, the first rail guide having a first and second rail edge and the second rail guide having a third and fourth rail edge, wherein the first rail edge removably engages the first end retaining channel, the second rail edge removably engages the second end retaining channel, the third rail edge removably engages the third end retaining channel, and the fourth rail edge removably engages the fourth end retaining channel such that the pleated media filter is retained in an extended position between the first and second rail guides.