Double Walled Flat Oval Spiral Duct includes an external pressure tight metal shell and a 12.5/ 25/ 50mm thick of fibreglass/ mineral wool/ PUF insulation. The Spiral Duct has internal plan protective metal liner, which makes it suitable for thermal insulation or perforated metal inner liner for acoustic insulation. The Spiral Duct is corrosion resistant and has high tensile strength. Double Walled Flat Oval Spiral Duct is available in application specific design and accurate in dimension.
