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• 

  4006
  4″ x 6′ UL 2158A Semi-Rigid Transition Duct 90 Degree Close Elbow Kit

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• 

  302UL
  4″ x 8′ UL 2158A Semi-Rigid Transition Duct

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• 

  4008
  4″ x 8′ UL 2158A Semi-Rigid Transition Duct 90 Degree Close Elbow Kit

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• 

  3120UL
  4″ x 8′ UL 2158A Semi-Rigid Transition Duct Kit

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