https://www.techpowerup.com/326057/chieftec-intros-the-pro-mini-az-01b-op-micro-atx-case CHIEFTEC today introduced the PRO Mini (model: AZ-01B-OP) Micro-ATX tower case. The CHIEFTEC PRO Mini presents a modern Micro-ATX mini tower PC case with a timelessly elegant, brushed front panel, complemented by an interior designed with a modern layout for optimal hardware and cooling compatibility.
The CHIEFTEC PRO Mini features added sound-absorbing material on the side and front panels to provide an optimized noise level, while a total of 8 possible fan mounts provide flexible cooling configurations. The PRO Mini is ready to deliver customers an ideal combination of performance, noise level, and quality design.
I think Chieftec decided this would be a sound dampening case.