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Description:Specification: Φ47, 58 or 70, angle 45° Material: imported colorized steel board is adopted as the outside drum and the inside adopts SUS304.2B stainless steel; especially the thicker insulation layer is made from intellectual polyurethane molding by imported air compressor design for cold-days and the chilliest areas; vacuum tubes are all from Qinghua University; cold rolling molds the stock then makes static spray-painting Feature: specially designed for even -roofs and customers of cater-corner roofs. It is strong enough against gales and takes less space