During the operation of the centrifugal fan, it is necessary to ensure that the bearing housing and all equipment requiring lubrication are filled with the lubricant or grease recommended by the manufacturer to the correct oil level. The grades of lubricating oil (grease) are in accordance with the requirements of the drawings. If the drawings are not specified, the following requirements can be referred to:

Lubricating oil is generally N32 machine oil in winter and N46 machine oil in summer (GB/T3141-1994). The amount of oil refueling is based on the upper and lower oil mark lines on the bearing housing, that is, to ensure that the oil level is at the midline oil level between the upper and lower oil mark lines (Note: There is an oil level sight glass (transparent) on the bearing housing. There are upper and lower line scales for the oil level on the mirror, and the amount of oil is generally kept between the two scale lines. Don't blindly pursue more oil, too much oil will cause oil leakage in the bearing housing).