Questions about be quiet! Light Base 900DX

what exactly is the difference to the 900 FX? :)

Hello, I am interested in purchasing the be quiet! Dark Base 900DX and would like to confirm a few details regarding the case's ventilation. I noticed in some photos that the case appears to have solid panels with no visible vents. Could you please confirm how many vents or mesh panels the case includes for proper airflow, and whether it comes with built-in fan filters? Thank you for your assistance. I look forward to your response. Best regards.