Office Chair with 680mm Depth

For office chairs strictly matching a depth of 680mm, it is recommended to choose specific models of the Kana Second-Generation Office Chair (such as CKN82KC and CKN60KC). The following is a detailed analysis:

1. Kana Second-Generation Office Chair: Clearly marked with a depth of 680mm
According to the reference information, some models of the Kana Second-Generation Office Chair (such as CKN82KC and CKN60KC) are clearly marked with a depth of 680mm. This size directly meets user needs, and the '680' in the model name may be related to its depth design, further verifying the accuracy of the size. This series of office chairs usually adopts ergonomic design and supports multi-level adjustment functions (such as headrests, armrests, and lumbar supports), making them suitable for long-term office scenarios and the first choice for strictly matching size requirements.

2. Zhenyuan Office Conference Chair (ZY-7612): Close in size but not fully matching
The depth of the Zhenyuan ZY-7612 model is 740mm. Although it is close to 680mm, there is a 60mm difference. For users who are sensitive to space or have precise requirements for seat depth, this difference may affect the user experience (such as insufficient leg support or the back being left unsupported due to an overly deep seat). Therefore, this model is more suitable for scenarios where depth requirements are not strict or as an alternative option.

3. Ergonomic Chair H680: Model implies but size is not clear
The model number of the Ergonomic Chair H680 includes '680', which may imply its depth design, but the reference information does not clearly indicate the specific size. Such naming methods are common in product series, but the actual size should be based on official data. If users choose solely based on the model number, there may be a risk of size deviation. It is recommended to prioritize products with clearly marked sizes.

Summary and Recommendations
If a strict match to a depth of 680mm is required, the Kana Second-Generation Office Chair (CKN82KC and CKN60KC) is the only clearly compliant option. Its ergonomic design, multi-level adjustment functions, and precise sizing make it better suited to meet office scenario needs. Other models may be close in size but not fully matching or have unclear information, so it is recommended to choose them with caution. Before purchasing, you can further contact the manufacturer to confirm size details to ensure the product meets expectations.