Quality inspection aluminum window material: aluminum windows and doors when the materials and accessories approach, check product certification or quality assurance and other accompanying technical documents, verify the performance and quality indicators of their labels. Substrate thickness with a resolution of 0.5μm thickness detector and an accuracy of 0.02mm vernier card ruler and profiles were measured thickness of the wall thickness of the surface treatment layer in different parts of the profile, bridge aluminum doors and windows installed, many measuring points at 3:00. Aluminum alloy doors and windows installed doors and windows installed to comply with the installation process, the wholesale bridge aluminum doors and windows, always check and adjust the quality of each step of the installation. Window frames and window openings have to draw the midline, bridge aluminum doors and windows, window frames aligned to the center line into the hole, bridge aluminum doors and windows manufacturer for temporary fixed frame angle, carefully adjust the vertical of the sash, horizontal and vertical degrees point of view, the error should be within the allowable deviation range.