Shroud for aircraft duct

A shroud for a duct comprising a generally cylindrical resilient tube formed from an organic aramid fiber, said tube having an axially extending slot along its entire length whereby adjacent edges of the tube by the slot can be pulled apart so the tube can be inserted over a duct, at least one radially inwardly extending clamping band receiving groove situated transverse to the axis of said tube, said groove including a base which is radially inwardly spaced from the circumferential periphery of said cylindrical tube, said base adapted to receive a clamping band whereby the cylindrical shroud can be clamped to a duct mounted therein, a generally cylindrical spacer member formed from a selected elastomeric material mounted on the inner surface of said base member so the clamping band can clamp the shroud to said duct, said spacer member including a plurality of angularly spaced inwardly projecting abutments adapted to engage the peripheral surface of a duct defining thereby an insulating air gap between said shroud and the surface of said duct, the space between said angularly spaced inwardly projecting abutments defining channels through said spacer member for the passage of gases along the length of the air gap.