Agilent Technologies TwisTorr 305-IC Mode D'emploi page 252

8 Technical Information
Assembling procedure Air Cooling Kit X3500-68010
2
Figure 31
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Now fix the air cooling bracket/fan assembly to the pump body.
A On board CNTR
B Foreline flange KF16
C VENT screw
D Fan
TwisTorr 305-IC User Manual / 87-901-058-01