This Agilent Varian 305-IC (with Integrated Controller) fan air cooling kit can be powered directly by 24V DC or using the fan output from the integrated controller. This Fan Kit when powered by 305-IC turbo's integrated controller must also be used with an adapter kit Agilent PN (X3514-68001, see middle graphic to the side) that connects on to the integrated controller on the 305-IC turbo pump. For fan install instructions see pages 250-254 in the Agilent 305-IC TwisTorr turbomolecular user manual in pdf format below.