The fiberglass seal disc is installed on top of the fan hub and helps prevent hot air recirculation back through the middle of the fan system. The seal disc adds approx. The inlet bell consists of several segments of formed fiberglass that are installed below the fan to shape the air flow and reduce turning losses due to the abrupt corners in fan rings. This shaped air flow improves air distribution and fan efficiency. Excessive or irregular tip clearance causes uneven blade tip loading, reduced air draw, hot air recirculation and repetitive vibration.
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We recommend Aprovis 55 synthetic oil, available through Hudson. It depends on the fan diameter and the fan hub being used. Every Customer and plant location will differ somewhat and there is no substitute for a well executed Maintenance Program. My cooling tower fan blades have pits in the leading edges. Cooling tower fill gets blocked by algae growth, etc., which leads to air flow restrictions in different quadrants under the fan.