1.heat insulation 2.suitable price 3.noisy resistance. 4.excellent service. 5.fireproof 1.Thermal insulation. noise insulation, perfect sealing, elegant appearance and wonderful ventilation2.surface is treated with powder spraying, multiple colors optional.3.Double layer glass with chamber, availableoption:5+9A+5mm,5+12A+5mm,6+9A+6mm,6+12A+6m4.According to door openning style, classified as: ...