Blade and grille assembly

When the blade and the grating assembly comprising the blade are applied to a wall close to an air conditioner outdoor unit, the airflow short circuit phenomenon that airflow blown out of the air conditioner outdoor unit flows through the blade and then is sucked back by the air conditioner outdoor unit again is restrained. The blade comprises an air inlet section and an air outlet section, the air inlet section is formed by connecting a plurality of sections of curves in contour lines of the section, in the direction orthogonal to the length direction, of the blade, in the contour lines, the intersection point of the connecting line (X) of two points with the largest distance and the air inlet section forms an air inlet section end point (B), and the air outlet section end point (B) is formed by the connecting line (X) of the two points with the largest distance. When the maximum distance between the part, located on one side of the connecting line, of the contour line and the connecting line (X) is set to b