In view of this situation, the best way is to use cubic steel on the upper and both sides of the door opening. The normal size can be used: the thickness of the square steel above 3mm, the square steel of 10*5 cm, and the fast rolling door fixed on the square steel is very firm. There are two forms of square steel, one is ordinary steel, and the other is paint material. The paint material is beautiful and dust-proof. It is recommended to use painted square steel in the clean area of the clean room.

    Since the SEPPES fast rolling shutter door is a self-supporting track design, the main load bearing of the fast door is on the ground after installation, and the wall fixing is an auxiliary, so for the door opening of small size, it is not necessary to add square steel to reduce the material cost of customers, but it is slightly larger. For the size of the hole, for the sake of safety, it is recommended to add square steel to fix it.