How long should the Feng Shui bead curtain be? Does it taste good？

Bead curtain, most of them can only dissolve evil spirits, but can't play the role of regulating qi activity. For example, if you want to use the bead curtain as a porch, you can't solve the evil spirits of the flow, but it will help to solve the arrow that goes through the hall and get straight to the point. In other words, the actual shape must prevail. Then whether it is a thick curtain or a bead curtain, it must be above the knee. In other words, its shielding length must be below the knee and 2 or 30 cm from the ground.