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Webasto or Eberspacher 90mm Air Heater Intake Ducting Silencer Genuine Webasto air intake ducting silencer Reduces ducting noise without restricting the heater Length: 320mm, Width: 120mm, Suits 90mm ID ducting Suitable for any air heater version using up to 90mm air outlet ducting Compatible with Webasto and Eberspacher ducting adapters for smaller intakes Please note: This silencer is intended for installation on the cold air intake, this should not be installed on the hot air outlet side of the heater.