Specification Details Model Lian Li O11 Air Black Case Type Mid-Tower PC Case Color Black Materials Steel chassis with mesh front and tempered glass side panel Motherboard Support E-ATX / ATX / Micro-ATX / Mini-ITX Drive Bays 3 × 3.5″ HDD / 2.5″ SSD combo + dedicated 2.5″ SSD mounts Expansion Slots 8 horizontal expansion slots Front I/O USB-C × 1, USB-A × 2, Audio In/Out, Power button Cooling Support — Front Up to 3 × 120 mm or 2 × 140 mm fans Cooling Support — Top Up to 3 × 120 mm or 2 × 140 mm fans Cooling Support — Side Up to 3 × 120 mm fans (mesh intakes) Cooling Support — Bottom Up to 3 × 120 mm fans Radiator Support Front: up to 360 mm • Top: up to 360 mm • Side: up to 360 mm Included Fans Varies by bundle; mesh version often ships with high-airflow fans PSU Compatibility Standard ATX PSU (bottom-mounted) PSU Shroud Full PSU shroud with cable routing Tempered Glass Side tempered glass window Dust Filtration Removable mesh filters (front/top/bottom) Cable Management Built-in routing channels and Velcro straps GPU Orientation Horizontal mounting (supports up to long GPUs) Use Case High-airflow gaming build, water-cooling, broad fan/radiator support Special Features Air-optimized airflow design with strong intake mesh