A method of making a 3D tube and the 3D tube made thereby. The method comprises: inserting a deflated pre-formed bladder into the 3D tube; and inflating the pre-formed bladder to deform the 3D tube and make the 3D tube have a substantially similar shape as that of the pre-formed bladder inflated.

A method of making a 3D tube and the 3D tube made thereby. The method comprises: inserting a deflated pre-formed bladder into the 3D tube; and inflating the pre-formed bladder to deform the 3D tube and make the 3D tube have a substantially similar shape as that of the pre-formed bladder inflated.

System and method for shaping a duct section. The duct section is configured to be expandable from a flattened configuration to an expanded configuration. The system includes an inflatable enclosure insertable within the duct section while being in the flattened configuration. The inflatable enclosure defines an opening for inflating the inflatable enclosure. The system also includes a blower for inflating the inflatable enclosure through the opening from a deflated configuration to an inflated configuration. In use, when the inflatable enclosure is inserted within the duct section, the blower inflates the inflatable enclosure through the opening from the deflated configuration to the inflated configuration, whereby the duct section expands from the flattened configuration to the expanded configuration as the inflatable enclosure pushes against the duct section from within.

System and method for shaping a duct section. The duct section is configured to be expandable from a flattened configuration to an expanded configuration. The system includes an inflatable enclosure insertable within the duct section while being in the flattened configuration. The inflatable enclosure defines an opening for inflating the inflatable enclosure. The system also includes a blower for inflating the inflatable enclosure through the opening from a deflated configuration to an inflated configuration. In use, when the inflatable enclosure is inserted within the duct section, the blower inflates the inflatable enclosure through the opening from the deflated configuration to the inflated configuration, whereby the duct section expands from the flattened configuration to the expanded configuration as the inflatable enclosure pushes against the duct section from within.