What is the true PSU clearance in the HAVN HS 420 case? Can I use a PSU longer than 220mm?

You can install a PSU longer than 220mm in the HS 420 case—up to 290mm total space is available in the PSU chamber. However, similar to other HAVN chassis designs, the 220mm recommendation is based on preserving adequate space for cable management.

Here's how it works:

• 220mm is the recommended PSU length to ensure a clean and manageable cable routing experience.

• The total clearance available is 290mm, meaning there is 70mm of space reserved for power cable bend radius and connectors.

If you use a 230mm PSU, you’ll still have 60mm of cable clearance, which should be sufficient in most builds. There are no structural blocks or ledges that prevent longer PSUs from being installed—as long as you stay within the 290mm total PSU bay depth.

Just keep in mind that:

• Larger PSUs may crowd cable space.

• Tighter clearance may affect ease of installation or airflow around the PSU.

In summary: Yes, a 230mm PSU will fit in the HS 420, but plan for slightly tighter cable routing than with a shorter unit.