Marketair has released the RD-Series and PD-Series commercial rooftop enclosure and support systems. The series are designed exclusively for multiple linesets used with variable refrigerant flow/volume (VRF/VRV) multi-split systems. Marketair’s RD-Series (rectangular, metal) and PD-Series (round, PVC) complement each other and potentially save up to 35 percent in contractor labor compared to custom-fabricated lineset ducting. They are essential for preventing mechanical damage and premature insulation degradation from UV light, animals and insects. The RD-Series features a proprietary, anti-corrosive, scratch-resistant hot-dipped and chromium-free zinc, aluminum and magnesium coating. The PD-Series is designed for stand-alone use on smaller VRF projects, or it can function as a complementary transition piece between a condenser and an RD-Series run of multiple linesets.