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In general terms, this disclosure is directed to a window assembly and a window spacer. In one possible configuration and by non-limiting example, the window assembly includes a first sheet, a second sheet, and a spacer arranged between the first sheet and the second sheet. The spacer includes a fir

In general terms, this disclosure is directed to a window assembly and a window spacer. In one possible configuration and by non-limiting example, the window assembly includes a first sheet, a second sheet, and a spacer arranged between the first sheet and the second sheet. The spacer includes a first elongate strip, a second elongate strip, and continuous sidewalls or a plurality of sidewalls. In some embodiments the sidewalls include a first portion having a first fastening mechanism and a second portion have a second fastening mechanism. The first fastening mechanism is arranged and configured to securely engage with the second fastening mechanism to connect the first portion with the second portion.

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1. A spacer comprising: a first metal elongate strip comprising a first elongate strip edge along a first side of the spacer and a second elongate strip edge along a second side of the spacer; a second metal elongate strip comprising a first elongate strip edge along the first side of the spacer and

1. A spacer comprising: a first metal elongate strip comprising a first elongate strip edge along a first side of the spacer and a second elongate strip edge along a second side of the spacer; a second metal elongate strip comprising a first elongate strip edge along the first side of the spacer and a second elongate strip edge along the second side of the spacer; a first non-metal sidewall engaging the first elongate strip to the second elongate strip, wherein the first sidewall is closer to the first side of the spacer than to the second side of the spacer, wherein the first sidewall is offset from the first edge of the first elongate strip and from the first edge of the second elongate strip by an offset distance; a second non-metal sidewall engaging the first elongate strip to the second elongate strip, wherein the second sidewall is closer to the second side of the spacer than to the first side of the spacer, wherein the second sidewall is offset from the second edge of the first elongate strip and from the second edge of the second elongate strip by the offset distance; and a desiccant between the first elongate strip and the second elongate strip. 2. The window spacer of claim 1, wherein the first sidewall is a continuous sidewall. 3. The window spacer of claim 1, wherein the sidewall comprises: a first portion connected to the first elongate strip, the first portion including a first fastening mechanism; anda second portion connected to the second elongate strip, the second portion including a second fastening mechanism, wherein the first and second fastening mechanisms are arranged and configured to secure the first portion to the second portion to couple the first elongate strip to the second elongate strip. 4. The window spacer of claim 3, wherein the first fastening mechanism comprises a protrusion configured to engage the notched portion. 5. The window spacer of claim 1, wherein the first elongate strip has an undulating shape defining a first waveform. 6. The window spacer of claim 5, wherein the first waveform is a sinusoidal waveform, an arcuate waveform, a square waveform, a rectangular waveform, a triangular waveform, or a sawtooth waveform. 7. The window spacer of claim 5, wherein the first waveform has a period in a range from about 0.005 inches to about 0.1 inches and an amplitude from about 0.005 inches to about 0.1 inches. 8. The window spacer of claim 1, wherein the second elongate strip includes a plurality of apertures, wherein the plurality of apertures are in a range from about 100 apertures to about 1000 apertures per meter length of the second elongate strip. 9. The window spacer of claim 1, wherein the second elongate strip has an undulating shape defining a second waveform. 10. The window spacer of claim 9, wherein the second waveform further defines an arcuate waveform, a square waveform, a triangular waveform, or a sawtooth waveform. 11. The window spacer of claim 1, wherein the first and second elongate strips are separated by a distance from about 0.02 inches to about 0.3 inches. 12. The window spacer of claim 1, wherein an overall thickness of the window spacer from a side of the first elongate strip to an opposite side of the second elongate strip is in a range from about 0.05 inches to about 1 inch. 13. The window spacer of claim 1, wherein the metal is stainless steel. 14. The window spacer of claim 1, further comprising at least one filler between the first elongate strip and the second elongate strip, the filler including the desiccant wherein the desiccant is in a bead form. 15. The window spacer of claim 1, further comprising at least one filler between the first elongate strip and the second elongate strip, wherein the filler is a matrix material. 16. A sealed unit assembly comprising: a first transparent material;a second transparent material; anda spacer assembly disposed between the first and second transparent materials, the spacer assembly having a first side and a second side, the spacer assembly comprising: a first metal elongate strip having a first edge along the first side of the spacer assembly adjacent the first transparent material and a second edge along the second side of the spacer assembly adjacent the second transparent material;a second metal elongate strip having a first edge along the first side of the spacer assembly adjacent the first transparent material and a second edge along the second side of the spacer assembly adjacent the second transparent material; anda first sidewall connecting the first elongate strip to the second elongate strip, wherein the first sidewall is closer to the first side of the spacer assembly than to the second side of the spacer assembly, wherein the first sidewall is offset from the first edge of the first elongate strip and from the first edge of the second elongate strip by an offset distance; anda second sidewall connecting the first elongate strip to the second elongate strip, wherein the second sidewall is closer to the second side of the spacer assembly than to the first side of the spacer assembly, wherein the second sidewall is offset from the second edge of the first elongate strip and from the second edge of the second elongate strip by the offset distance. 17. The window assembly of claim 16, wherein the spacer assembly, the first transparent material, and the second transparent material define an interior space therebetween, and wherein a gas is disposed within the interior space. 18. The window assembly of claim 17, wherein the gas comprises a dry gas comprising air, oxygen, nitrogen, argon, krypton, or mixtures thereof. 19. The window assembly of claim 17, wherein the second elongate strip includes apertures allowing communication of the gas of the interior space through the second elongate strip. 20. The spacer of claim 1 wherein the offset distance is at least about 0.01 inches. 21. The spacer of claim 1 wherein the offset distance is at least about 0.1 inches. 22. The spacer of claim 1 wherein a space is defined on each side of the spacer between the edges of the first and second elongate strips and adjacent to each of the sidewalls. 23. A sealed unit assembly comprising: a first transparent material;a second transparent material; anda spacer assembly disposed between the first and second transparent materials, the spacer assembly comprising a first side adjacent the first transparent material and a second side adjacent the second transparent material, the spacer assembly further comprising: a first metal elongate strip, the first elongate strip comprising a first strip edge along the first side of the spacer assembly and a second strip edge along the second side of the spacer assembly;a second metal elongate strip, the second elongate strip comprising a first strip edge along the first side of the spacer assembly and a second strip edge along the second side of the spacer assembly; andfirst and second sidewalls connecting the first elongate strip to the second elongate strip, wherein the first sidewall is closer to the first side of the spacer than the second side of the spacer and offset from the edges on the first side of the spacer by an offset distance, wherein the second sidewall is closer to the second side of the spacer than the first side of the spacer and is offset from the edges on the second side of the spacer by the offset distance, wherein the offset distance is at least about 0.01 inches;wherein a space is defined on each side of the spacer between the edges of the first and second elongate strips and adjacent to each of the sidewalls, wherein the spaces comprise sealant and wherein the sealant seals the spacer to the first transparent material and the second transparent material. 24. The sealed unit assembly of claim 23 wherein the offset distance is at least about 0.1 inches. 25. The sealed unit assembly of claim 24, wherein the first elongate strip has an undulating shape defining a first waveform and defines a period in a range from about 0.005 inches to about 0.1 inches and an amplitude from about 0.005 inches to about 0.1 inches. 26. The sealed unit assembly of claim 25, wherein the first and second elongate strips are separated by a distance from about 0.02 inches to about 0.3 inches. 27. The sealed unit assembly of claim 26, wherein an overall thickness of the window spacer from a side of the first elongate strip to an opposite side of the second elongate strip is in a range from about 0.05 inches to about 1 inch.