When buying this kind of door window, still should pay attention to check processing quality.  High quality aluminum alloy doors and windows processing is very fine, good installation, good sealing performance.  

Inferior aluminum casement egress window, materials and specifications are not up to standard, processing is not uniform, poor sealing performance, not only wind and rain leakage, but also in the case of strong wind and excessive external force is prone to glass explosion and other phenomena resulting in glass scraping or falling.