Reusable filter frame

1. A filter frame for use with a replaceable filter media comprising:

an upstream frame section having an upstream frame section configuration of a planar upstream member defining a plurality of upstream openings, said planar upstream member includes a first sidewall and a second sidewall projecting downstream from said planar upstream member, wherein said second sidewall is shorter than said first sidewall, the upstream frame section first sidewall having a wider perimeter than the second sidewall;

a downstream frame section having a downstream frame section configuration of a planar downstream member defining a plurality of downstream openings, said planar downstream member includes a first sidewall and a second sidewall projecting upstream from said planar downstream member, wherein said second sidewall is shorter than said first sidewall, the first downstream frame section sidewall having a wider perimeter than the second sidewall;

wherein, the upstream frame section configuration and the downstream frame section configuration match each other;

said first sidewall of said upstream frame section overlaps said second sidewall of said downstream frame section in the direction of air flow from said planar upstream member towards said planar downstream member by the perimeter of first sidewall of the upstream section being wider than the second sidewall of the downstream frame section thereby placing the first sidewall of the upstream section and the second sidewall of the downstream frame section being in overlapping side by side relationship in the direction of airflow; and

said second sidewall of said upstream frame section overlaps said first sidewall of said downstream frame section in the direction of air flow from said planar upstream member towards said planar downstream member by the first sidewall of the downstream section being wider than the second sidewall of the upstream frame section thereby placing the first sidewall of the downstream section and the second sidewall of the upstream frame section being in overlapping side by side relationship in the direction of airflow;

wherein the upstream frame section and the downstream frame section are the same construction and when joined together, the joined upstream frame section and downstream frame section substantially match the shape of a rectangular replaceable filter media and are operable to retain the replaceable filter media between the upstream frame section and the downstream frame section.

2. The filter frame of claim 1 in combination with the filter media, wherein said filter media is contained with said upstream frame section and said downstream frame section.

3. The filter frame of claim 1 wherein said first sidewall of said upstream frame section includes detents and said second sidewall of said upstream frame section includes detent openings.

4. The filter frame of claim 1 wherein said first sidewall is positioned at a larger perimeter than said second sidewall.

5. The filter frame of claim 1 wherein said upstream frame section is rectangular in shape with an outer periphery including four sides, and in sequence about said outer periphery said first side includes said first sidewall, then said second side includes said first sidewall followed by said second sidewall, then said third side includes said second sidewall, and then said fourth side includes said second sidewall followed by said first sidewall.

6. The filter frame of claim 1 wherein said first sidewall of said upstream frame section surrounds said second sidewall of said downstream frame section, and said first sidewall of said downstream frame section surrounds said second sidewall of said upstream frame section.

7. A filter frame for use with a replaceable filter media comprising:

a first rectangular frame section having a substantially planar member defining a plurality of openings within an outer periphery, a first sidewall interconnected with a second sidewall projecting away from said planar member along said outer periphery of said planar member, wherein said second sidewall projects less than said first sidewall away from said planar member;

wherein said first sidewall is positioned at a larger perimeter than said second sidewall; and

wherein a distal end of said first sidewall spaced away from said planar member includes detents and a proximal end of said second sidewall adjacent said planar member includes detent openings;

a second rectangular frame section having the same matching construction of the first rectangular frame section and joinable with said first rectangular frame section to retain a replaceable filter media between the first rectangular frame section and the second rectangular frame section, the first and the second rectangular frame section each having an inner surface facing each other when joined, the first rectangular frame section rotated 180 degrees relative to the second rectangular frame section when joined and overlapping the first sidewall of the first rectangular frame section with the second sidewall of the second rectangular frame section in the direction of airflow through the joined filter frame, and overlapping the first sidewall of the second rectangular frame section with the second sidewall of the first rectangular frame section in the direction of airflow through the joined filter frame.

8. The filter frame of claim 7 in combination with a filter media, wherein said filter media is contained within said first rectangular frame section and said second rectangular frame section.

9. The filter frame of claim 7 wherein said first sidewall of said first rectangular frame section surrounds said second sidewall of said second rectangular frame section, and said first sidewall of said second rectangular frame section surrounds said second sidewall of said first rectangular frame section.

10. The filter frame of claim 7 wherein said detents of said first rectangular frame section operably engages said detent openings of said second rectangular frame section, and said detents of said second rectangular frame section operably engages said detent openings of said first rectangular frame section.

11. The filter frame of claim 7 wherein said outer periphery including four sides, and in sequence about said outer periphery said first side includes said first sidewall, then said second side includes said first sidewall followed by said second sidewall, then said third side includes said second sidewall, and then said fourth side includes said second sidewall followed by said first sidewall.

12. The filter frame of claim 7 wherein opposing edges of said first sidewall adjacent said second sidewall are angled away from said second sidewall creating an outwardly facing surface from said planar member.

13. The filter frame of claim 7 wherein said frame section includes an outwardly projecting flange outside said second sidewall adjacent said planar member.

14. A method of manufacturing a reusable filter frame for use with a replaceable filter media comprising the steps of:

molding two of the same frame sections, wherein each said frame section is rectangular in shape, each said frame section has a substantially planar member defining a plurality of openings within an outer periphery and a first sidewall interconnected with a second sidewall projecting away from said planar member along said outer periphery of said planar member, wherein said second sidewall projects less than said first sidewall away from said planar member, and wherein said first sidewall is positioned at a larger perimeter than said second sidewall; and

assembling said two frame sections by reversing one said frame section and rotating 180 degrees before combining together resulting in said first sidewall of each said frame section surrounding said second sidewall of each other said frame section, respectively.

15. The method of claim 14 further comprising the step of providing a filter media within said two frame sections before the step of assembling.

16. The method of claim 15 further comprising the step of replacing said filter media.

17. The method of claim 14 wherein the step of assembling the two frame sections includes the step of locking said two frame sections together.

18. The method of claim 17 wherein the step of locking said two frame sections includes engagement of a plurality of detents with a plurality of detent openings.