Doors and windows are divided into enclosure members or partition members according to their different positions. There are different design requirements to have functions such as heat preservation, heat insulation, sound insulation, waterproofing, and fire prevention. The new requirements are energy-saving. Cold areas are caused by the gaps between doors and windows. The heat loss accounts for about 25% of the total heating heat consumption. The airtightness requirements of doors and windows are an important part of energy-saving design. Doors and windows are important components in the building envelope system. Function 2: Doors and windows are also an important part of architectural modeling (contrast between virtual and reality, rhythmic artistic effects, play an important role), so their shape, size, proportion, arrangement, color, shape, etc. are all important to the overall shape of the building. Have a great impact.