-The sealed drain system and dry fixed construction has the excellent airproof and waterproof ability;
-With variety of opening ways and optional aeration and the degree of the opening;
-The glass can be taken down easily at room, which make the maintenance and glass-change convenient, in addition to the colorful decoration;
-Safe and convenient opening of leaf, and it can be cleaned easily;
-Carrying the ��equal size room�� theory obtain the excellent hear-preservation, sound insulation and less-transfiguration ability; the superiority is fit for the large grille;
-By using the 20mm insulation bar and improve the heat-insulated and heat preservation ability of series 60.