Fairing and fan device

A fairing, comprising a fairing body which is arranged at an air vent of a fan, wherein an axis of the fairing body is collinear with an axis of the fan rotation shaft of the fan, wherein the fairing body has a fairing area, the fairing area is annular and is located at a periphery of a geometric center of the fairing body perpendicular to the axis of the fan rotation shaft, and the fairing area is provided with a plurality of fairing through holes,

• wherein the fairing body is provided with a non-fairing area at an inner side of an inner ring of the fairing area perpendicular to the axis of the fan rotation shaft, and the non-fairing area is provided with a material saving structure,
• wherein the material saving structure is a material saving through hole, an area of the material saving through hole is larger than each of the plurality of fairing through holes and a hole wall of the material saving through hole coincides with the inner ring of the fairing area,
• wherein, along the axis of the fan rotation shaft, an inner side surface, close to the fan, of the non-fairing area is flush with an inner side surface of the fairing body, and an outer side surface, away from the fan, of the non-fairing area is flush with an outer side surface of the fairing body,
• wherein, if an outer ring of the fairing area is in shape of circle, R≥R0;
• if the outer ring of the fairing area is in shape of polygon, L≥R0;
• wherein R is a radius of the outer ring of the fairing area, R0 is an inner diameter of a fan duct, and L is a minimum distance between a side of the polygon and a geometric center of the polygon.