These are basically U-shaped trays, the length being more than the width. They are held horizontally in both hands so that the back or arch of the U is near the body. The fans have a maximum depth at the back, gradually flattening into a horizontal surface in the front, so that the grain can be poured out easily.

There are shallow and deep winnowing fans. The former are made by stretching a mat within a rim made of bamboo splints. The maximum depth is determined by the width of the strengthened rim, which is perpendicular to the mat at the back. Along the sides, the splints are warped to lie almost horizontal in the plane of the mat in front. The difference in the deeper winnowing fans is that the mat is cut, folded and stitched to create a greater depth at the back.

Dustpan, the winnowing fan main difference lying in the edge strengthening (fig.604). The cut ends of the fold on the inside are covered by a half split of cane which is tied through the mat by a thin cane split. The diagonally cut corners on the outside are covered by a single half split of cane that is tied over one fold, across the base of the fold at the bottom and up to cover the cut edge on the other side. The rim is strengthened by a half split of a thicker cane beginning on the inside top of the arch. It is folded back on itself and continued all along the outside sandwiching the edge of the mat. At the other front corner it is folded onto the front again to overlap at the start. The two ends are cut at an angle so that the overlapped portion has the same thickness as the rest of the rim. The front edge of the tray is strengthened in a similar manner (fig. 605). The two rims are interlooped at the front corners. The mat in this winnowing fan is also strengthened by three additional cane splits running through the weave along the central axis.

A winnowing fan made one of the Southeast Asian countries (fig.609). The wide flat spaced-out warp strips are turned upwards at the back to create the depth. The weft, a continuous strip made from narrow outer splits of bamboo, is woven back and forth across the width. This strip is twisted and folded over a bamboo split around the rim. The back surface of the fan is created by the weft moving in concentric semi-circles.

Two splints of bamboo sandwich the rim of the mat. A third narrow splint lies between them on the top edge of the fan. This splint is partially split into a number of strips so that the bend of the rim is accommodated, with the outer skin of the splint always facing upwards (fig.610). Two smaller splits of bamboo are tied on either side of the mat just below the rim to provide further strengthening. The front edge of the fan is finished by twisting a couple of weft elements around consecutive warp element to provide a tighter weave. The ends of the warp elements are twisted, folded underneath and inserted into the weave to prevent it from getting loose. There is no other strengthening on the front edge.