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Material	Galvanized steel , stainless steel
Specification	3"-100"(φ75~2500mm)
Thickness	0.5t、0.6t、0.8t、1.0t、1.2t
Standard length	3M/unit
Features	Inner tube is spiral round duct. Insulation materials used between inner tube and outer duct layer are of either long or short type carbonized fiberglass. Outer duct layer is in the form of standard spiral round duct.
Other components	FGA round duct flat ring flange or FGL round flat ring flange