The 1 section choice, small section, strength is not enough. Prevention of aluminum alloy doors and windows material does not meet the requirements. The quality of unqualified plastic steel door and window materials.
2 according to the specification of installation node.
3 without the use of different fixation methods according to different wall.
4 steel doors and windows lining steel configuration does not meet the standard, (general steel liner reached the national standard, but because of the mounting up owners can not see, many businesses would not have qualified for the owners to install steel thin wall), poor strength; steel lining sectional insert, form an overall strengthening effect; the steel lined with plastic profile connection is not strong.
First, the number of profiles. Specifications meet the national standard window frame. Aluminum alloy profile outer wall thickness of not less than 2.4 mm. The thickness of the plastic steel window should not be less than 2.5 mm.
Second. During the inspection of plastic material purchase appearance, qualified profiles should be a bluish white or ivory white, clean, smooth. Better quality protecting film.
Third. According to their size, door and window installation height selection section, the casement window is not less than 55, not less than 75 series sliding window.
Fourth. Strictly according to the rules of installation, ensure firm stability.