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Are you interested knowing more about lineset ducting system? If so, then you are in the right place. Feel relaxed and make sure you read the article to the end.

lineset ducting system

RectorSeal has developed the SlimDuct RD-Series and the PD-Series, commercial rooftop ducting and support systems that are designed for multiple linesets as used with variable refrigerant flow and multi-split systems or any other conventional air-conditioning and refrigeration systems. The company says both series save more than 75% in labor when compared to the alternative of custom-fabricated galvanized sheet metal lineset ducting or other labor-intensive fabrications. The RD-Series comprises 20-gauge, roll-formed rectangular sheet metal lineset duct and fittings. It features a proprietary, anti-corrosive, scratch-resistant hot-dipped and chromium-free ZAM® coating (zinc, aluminum, and magnesium) a more durable and lighter weight alternative to galvanized steel. Widths for the RD-300, RD-450, RD-600, and RD-900 are 12, 18, 24 and 36 in, respectively and all are 5-1/8-in high. Based on a 3/8-in by 3/4-in lineset with 1/2-in insulation on both lines, the RD-Series can accommodate the following number of linesets: RD-300 (8), RD-450 (12), RD-600 (19), and RD 900 (25). 

The PD-Series is designed for smaller installations which do not warrant the larger metal lineset duct. It also serves as a transition to protect the lineset from where it exits the VRF condenser until it enters the RD-Duct. The PD-Series differs from the RD-Series in that it consists of UV, fire, and weather-resistant  ivory-colored extruded PVC round duct in 2 sizes only, PD-90 (3.5-in diameter) and PD-120 (4.7-in diameter), and is available in 39 in and 60 in lengths.

Fortress Lineset Covers

Fortress Lineset covers are a precision system of premade ducting offering strength & longevity at a modest price point. Perfect for a variety of A/C systems, Fortress conceals/protects lineset, wiring & drain hose from weather/damage. Made in USA.


  • PVC, UV stabilized & fire resistant. Tested to over 2,000 hours. Temperature range -4°F to 140°F.
  • Compliments any residential or commercial building and Paintable- Brush, spray, or roller to match or complement custom colors, Duct & fittings are available in both LD92 (31/2″), LD122 (41/2″)
  • 8′ duct lengths in 2 sizes, 4 color options (white, ivory, brown & gray) and 17 fittings assure complete flexibility of installation
  • Snap together ducting is easily accessed for repairs or replacement of lineset.
  • 3 year warrants l

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