JH-V-T/S Double Layer Spiral Round Duct with Soundproof Effect
Material：Galvanized steel , stainless steel
Specification： 4"-60" Thickness： 0.4-1.2mm
Features：Inner core layer is perforated with an effective area of 30% ~ 40%. Insulation materials used between perforated core and outer duct layer are of either long or short type (1"×32K )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
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