Dust free case selection help

[in5n80]

I am looking for a simple and sturdy PC case with fine dust filters on front and bottom.
Top and sides all solid metallic.(If meshed, it should have fine dust filter)

Case fans: 140x2 in front, 120 or 80 in rear.

Type - Mid Tower ATX
Graphic card - None
Harddisk - None (Only M.2 sata)
DVD Drive - 1
Cooling - Intel CPU cooler only

Kindly avoid tempered glass side panels as the pc is for industrial usage.

 

[madmatt30]

Fractal design Define R4 or R5

Obviously the blackout not the windowed models

 

[in5n80]

Fractal design Define R4 or R5

Obviously the blackout not the windowed models

I liked the define R5 too. But in India fractal design cases are unavailable for unknown reasons. Can you please suggest cases from any other brands. I forgot to mention abt this in the query.sorry.