This type of duct is made of PET material. The inner part is filled with highly tensile spiral steel wires to support the transparent duct. Fiberglass with 25mm thickness 16kg-24kg/m3 is used for thermal isulation and outer jacket is covered by glass fiber clothes. The duct is generally applied on low to medium air velocity with temperature variantion system. This product has passed GB8624B1 fire resistant test.
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