1. use the site and its significance. Consider the Street gate, door, rooms, bathrooms, or channels used to choose the desired function in the product.
2. use the environment, conditions and requirements. Environment quality status should be considered, such as humidity, door structure, thickness, the left door or the right door, inside door or outside the door, in case of buying the wrong products.
3. coordination with decorative environments. According to their own preferences, consideration, coordination with bedroom product purchase and supporting facilities should be consistent.