Europe is the birthplace of the industrial revolution and mechanical manufacturing, so the underlying logic of European thinking is to solve problems through industrial products, and this inertia thinking is also followed in the issue of door and window water tightness.

For the water tightness performance of doors and windows, drainage holes are an indispensable outlet for the accumulated water inside the door and window structure to be discharged outdoors. However, when the outdoor wind speed is high, the wind pressure brought by the wind speed can easily cause poor drainage. If there is still rainfall at this time, the outdoor wind pressure will also "press" the outdoor rainwater into the door and window structure through the drainage holes. In addition, drainage holes are also channels for air flow and mosquitoes to enter the door and window structure, and the air flow will produce a "wind whistle" sound, which is a problem that needs to be solved in the design and manufacturing of doors and windows. Let's take a look at how the drainage hole accessories for European style doors and windows solve the above problems:

The one-way guide vane inside the side drainage hole cover: The principle of the one-way guide vane is a simple one-way valve principle, which only allows indoor airflow and water flow to flow towards the outside of the room. When encountering airflow or water flow from the outdoor side, the guide vane will be close to the drainage outlet to form a sealing effect. The premise is that the water tight chamber of the frame fan is at equal pressure to the outside

Unidirectional Elastic Drainage Hole Curved Plate: The principle of a unidirectional drainage hole curved plate is similar to that of a unidirectional guide plate, and the material is very particular. The basic working state is that the curved plate stays in contact with the drainage hole, allowing indoor water and airflow to pass through. When the outdoor airflow is strong, the curved plate bends inward, expanding the drainage outlet and achieving an equal pressure effect, accelerating drainage.

Drainage one-way valve: This is a mature industrial product that only allows indoor airflow and water flow to flow outward, while outdoor airflow and water flow are blocked, resulting in higher product costs.

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