*The sealed drain system and dry fixed construction obtain the excellent anti-air and anti-water 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 effect; * open the leaf Safely and conveniently, and the it can be cleaned easily; *carrying the “equal room ” theory obtain the excellent heat-preservation、sound insulation and less-transfiguration ability; the superiority is fit for the large grille *using the 24mm insulating ingot can get better ability than the other series 60 in heat-insulated and heat preservation;