With regard to air quality according to ISO 8573-1 we recommend:
Class Residual Oil
Lubricated air
4
Oil-free air
3
Illustration 1 - Installation
Residual Dust
particle
content
size
mg/m³
µm
5
15
1
5
7
max.
pressure
concentration
dew-point
mg/m³
°C
8
+3
5
-20
Residual Water
max.
concentration
g/m³
6
0.88