Picked products
RTR
    RTR
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    Round telescopic duct.
    RR
      RR
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      Round duct.
      RRF
        RRF
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        Round duct.
        RV
          RV
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          Round duct connector.
          FK
            FK
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            Flat air duct.
            FKF
              FKF
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              Flat air duct.
              RSV
                RSV
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                Flexible duct connector.
                FKV
                  FKV
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                  Flat air duct connector.
                  RB
                    RB
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                    Bend 90°.