Straight duct lengths The YellowDuct straight duct lengths are available in seven sizes with or without covers. Slotted duct / raceway is available in some sizes for vertical drops or applications inside equipment racks to allow cords to exit through the side of the duct. Some sizes are available with hinged covers (hinges included in pack), or clip on covers. All duct sizes come in 2m (6' 7") lengths, and where required, are slotted at each end for simply snapping together with an appropriate joiner. Most other ducting raceway brands are only available in 6 foot lengths - 10% shorter than YellowDuct.