First of all, Paiya
Second, Aowei doors and windows
Third, Fu Xuan.
Fourth, the choice of beauty.
Verb (abbreviation for verb) angel
Six, red oak tree
Seven, sen ying
Eight, mercer
Nine, the ocean
Tian dong
Doors and windows are divided into closing 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, waterproof and fire prevention. And the new requirement is energy saving. The heat loss from the gap between doors and windows in cold areas accounts for about 25% of the total heating heat consumption. The air tightness requirement of doors and windows is an important content in energy-saving design. Doors and windows are an important part of building envelope system.