当一个壁球高速撞向墙壁，产生了一个迷你真空。这种真空因为球的部分先碰壁然后立即离开再次出现。当这非常微小但是不均匀的真空会导致壁球墙上一小部分的石膏从墙上被吸走。 ASB系统40墙持久地防止这种现象发生。

ASB面板被垂直和水平地固定到现有的墙壁。 ASB的技术使ASB面板和现有墙壁间保持距离。像系统100那样，中间的空腔填满了被压缩的干燥石英砂。安装之后，墙面上没有任何可见的连接缝，和被专业的ASB涂料层覆盖。

在这种规格下，世界壁球联合会（WSF）特别了减少8厘米的宽度和长度给进行这种整修和翻新的壁球场，让这个小了一点的壁球场仍然符合联会规定的尺寸标准。

When a squash ball hits a wall at high speed a mini-vacuum is generated. This vacuum arises because the part of the ball, hitting the wall first immediately leaves the wall again. With the even smallest unevenness this mini vacuum causes small parts of the plaster to be sucked from the wall. The ASB system 40 wall prevents this phenomenon lastingly.

The ASB Carrier Panel is fixed to the existing wall and is aligned vertically and horizontally. ASB technology helps to keep the distance between existing wall and carrier panels. Like the system 100 wall, this cavity is filled with fire-dried silica sand, which is compressed. After this installation, the surface is without any visible joints and is covered with the ASB coating.

In its specifications the World Squash Federation (WSF) reduced the dimensions for renovated courts by 8 cm each in width and length for renovations and made these dimensions standard.