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Multi-layer inner duct wall reinforced with a spiral wire. The inner duct wall is covered with a fibre glass insulation. The insulation is covered with an outer jacket.

The insulation reduces the heat gain or loss resulting from a temperature difference between the air flowing in the duct and the surrounding air.

The outer jacket acts as a vapour barrier to prevent condensation to enter into the insulation. condensation can occur on the outside of a duct carrying air at lower temperatures than the surrounding air.