Marketair has introduced the RD-Series and PD-Series of commercial rooftop enclosure and support systems. Both series are manufactured by Osaka, Japan-based Inaba Denko, and designed exclusively for multiple linesets used with VRF/VRV multi-split systems. They are used extensively across the globe.

Marketair’s RD-Series (rectangular metal) and Series PD-Series (round PVC) are professional enclosure solutions for protecting multiple linesets commonly used with the emerging North American rooftop VRF system market. Both series complement each other and potentially save up to 35% in contractor labor compared to custom-fabricated galvanized sheet metal lineset ducting or other fabricated, labor-intensive alternatives, according to company officials. They also help to prevent mechanical damage as well as premature insulation degradation from ultraviolet (UV) light, and animal and insect pests. 

The RD-Series comprises 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) that provides a durable alternative to galvanized steel. Widths for the RD-300, RD-450, RD-600, and RD-900 are 12, 18, 24 and 36-inch (304.8, 457.2, 609.6, and 914.4-mm) respectively and all are 5-1/8-in (131-mm) high. Based on a 3/8-in by .75-in (9.5 x 19-mm) lineset with .5-in (12.7-mm) insulation on both lines, the RD-Series can accommodate the following number of linesets: RD-300 (13), RD-450 (19), RD-600 (26), and RD-900 (38).   

The PD-Series is UV, fire, impact and weather-resistant, ivory-colored extruded round PVC lineset enclosures. It’s designed for stand-alone use on smaller VRF projects, or it can function as a complementary transition piece between a condenser and a RD-Series run of multiple linesets. The duct lengths snap together lengthways and all fittings open in halves for easy access. It’s available in three sizes — the PD-90–3.5-in diameter (88.9-mm); PD-120–4.7-in diameter (120-mm); and PD-140–5.5-in (140-mm). The PD-90 and PD-120 sizes are available only in 78.75-in (200-mm) lengths.