Doors and windows are the two enclosure components in the house. The main functions are for traffic access, separation and connection of building space, ventilation and lighting, etc. The general requirements for checking doors and windows are that the installation is flat and firm, there is no warping deformation, the opening is convenient and flexible, the closing is tight, the function is reasonable, the maintenance is convenient, the spare parts are fully assembled and the position is accurate.

Commonly used door and window materials are wood, steel, aluminum alloy, plastic, glass and so on. Wooden doors and windows are easy to make and suitable for manual processing, which is a form that has been widely used. Steel doors and windows with high strength, small cross-section, less light blocking, fire prevention, steel doors and windows profiles used by continuous improvement, the formation of a variety of specifications series products. Ordinary steel doors and windows are easy to rust, heavy weight and high thermal conductivity. Now the newly developed aluminized fasting steel doors and windows, plastic-plated steel doors and windows, color plate steel doors and windows, hollow plastic steel windows have greatly enhanced the corrosion prevention and energy saving performance of steel doors and windows, and have been popularized and used in new residential buildings.

Aluminum alloy doors and windows are light, tall and beautiful, and have good airtight performance. They have been widely used in houses with high requirements. However, the thermal conductivity of aluminum alloy is large, the insulation is poor and the cost is high. At present, the use of materials with better insulation properties, such as plastic aluminum windows made of plastic isolation layers, can greatly improve the thermal performance of aluminum alloy doors and windows. Plastic doors and windows have good thermal performance, precision processing and corrosion resistance, which is a promising type of doors and windows. At present, the cost of plastic steel doors and windows produced in my country is high, and the strength, rigidity and aging resistance have yet to be improved. However, with the development of the plastics industry, the service life of high-strength, aging-resistant plastic doors and windows has reached more than 30 years, and plastic doors and windows will be more and more More applications.

At present, according to the regulations, plywood is not allowed to be used for the entrance door. The door lock should be installed firmly. Iron fences should be installed on the outer window on the ground floor, the window of the public walkway on the floor and the bright light on the entrance door. The glass of doors and windows should have a smooth surface, full of putty and firm pasting.