When the traditional return air column is applied, it takes up a lot of space and is anaesthetic. To solve these problems, Wiskind has invented the 100mm hollow return air wall panel, which can replace the return air column and 100mm hollow dome walls in the buffer room for dressing and shoe changing. The average return air volume reaches up to 500m2/h, which greatly improves the application scope of cleanroom spaces. The return air module is prefabricated in the factory, allowing for direct onsite installation, which is more convenient and faster.