Slimduct RD Metal Lineset Cover
Slimduct RD Metal lineset cover is a commercial-grade metal line set cover system designed to provide a clean, professional finish to exposed HVAC piping. Developed by Inaba Denko Japan, the Slimduct RD series is engineered specifically for VRF/VRV multi-split systems, offering the capacity to enclose multiple refrigerant line sets within a single protective housing.
Built for long-term performance, Slimduct RD Metal lineset cover features a hot-dipped, chromium-free coating made from zinc, aluminum, and magnesium. This advanced anti-corrosive finish delivers superior rust resistance, scratch resistance, and strength, all while remaining lighter than traditional galvanized steel. The result is a rugged metal solution capable of withstanding demanding commercial environments.
With its smooth profile and modern appearance, Slimduct RD Metal lineset cover enhances the look of any project, blending seamlessly into commercial buildings, multifamily properties, hotels, schools, and large-scale facilities. Its durability and easy installation help reduce labor time and overall project costs, making it a smart, value-driven choice for HVAC contractors and building owners.



Product Features
Durable High-Grade Steel
Slimduct RD Metal lineset cover is engineered from high-grade, corrosion-resistant hot-dip galvanized steel, providing exceptional durability even in highly corrosive environments. Its zinc, aluminum & magnesium coating offers superior corrosion resistance compared to traditional galvanized or stainless steel alternatives.

Aesthetic Appeal
Designed with a compact, streamlined profile, Slimduct RD Metal lineset cover delivers a clean, architectural finish to large commercial HVAC installations. The sleek metal body blends seamlessly with modern building facades, ideal for offices, hotels, schools, and multi-family properties, enhancing both curb appeal and perceived property value.
Easy Installation
Slimduct RD Metal lineset cover installs quickly using standard hand tools, making it convenient for contractors and maintenance personnel. Each unit comes with stainless-steel screws, eliminating the need for specialized tools or additional hardware and ensuring a secure, professional-grade assembly.
Load Capacity
The Slimduct RD Metal lineset cover has the RDW line that includes an embossed anti-slip surface, providing safe, stable footing for technicians accessing rooftop VRF/VRV line sets. This added capability enhances jobsite safety and simplifies routine maintenance.
| Distributor – US Mainland and Canada | Marketair |
|---|---|
| [email protected] | |
| Phone Number | (732) 985-8226 |
| Distributor – Hawaii | Cosco Air Conditioning & Refrigeration |
|---|---|
| [email protected] | |
| Phone Number | (808) 845-2234 |
Q. Can this product be used in soil affected by salinity?
A. You can use the Slimduct RD Metal lineset cover in areas with saline soil. Please review the Instruction Manual for detailed guidance.
Q. Can the standard type withstand a person’s weight or act as a passage?
A. Our standard metal lineset cover is not load-bearing. While the walkway type can support a person temporarily for maintenance, it’s not designed for regular foot traffic.
Q. The surface is starting to rust. Is it not corrosion-resistant?
A. The Slimduct RD Metal lineset cover is corrosion-resistant but not corrosion-proof. Damage made during installation or prolonged exposure can result in surface rust. Over time, protective zinc layers will degrade naturally. Please refer to the Product Catalog for more details.
Q. Can I switch from the standard type to the walkway type by changing only the cover?
A. No. The supports need to be upgraded to heavier-duty types for the Slimduct RD Metal lineset cover to safely function as a walkway type.
Q. What kind of brackets should I use to mount it on the wall?
A. Use S Type RZM Brackets and RZB Risers. For RD-150 type installation, use the 300 S Type or RZW brackets suited for wall mounting. Avoid longer bracket types that may cause balance issues.
Q. Is it possible to buy just a reinforcement plate?
A. Yes, you can purchase individual reinforcement plates by contacting Inaba Denko America or your nearest dealer.
Q. Do I need a wall plate or wall sleeve?
A. We recommend installing them. These accessories help prevent rainwater from entering the building. You may opt for a chamber box installation if water drainage is managed separately.
Q. If I install a standing Wall Sleeve or Wall Plate, will it completely stop water?
A. When properly installed as per the manual, the Slimduct RD Metal lineset cover prevents water penetration. However, effectiveness may vary by installation quality and environmental conditions.
Q. Can I use a free joint in place of a fixed joint?
A. Yes, if installed level to the ground. However, continuous use of free joints and corners may reduce strength over time. Fixed joints are recommended for stable and lasting installations.
Q. What should I know when cutting a straight-line duct?
A. Use high-speed cutters such as nippers, snips, or cutting wheels (for sizes above 450). After cutting, use a file to remove burrs and apply anti-rust treatment, such as Zn-Al type or zinc-rich paint, to protect your Slimduct RD Metal lineset cover from corrosion.
| Material | Highly corrosion-resistant hot-dip galvanized steel sheet has a coating layer of zinc, 6% aluminum, and 3% magnesium. |
|---|---|
| Tensile Strength | More than 274.6N/mm2 (=28kgf/mm2) (=39.885psi) |
| Salt Tolerance | Salt Resistant |
| Stretch | More than 28% |
Why Choose Inaba Denko America
Inaba Denko America produces HVAC accessories built using Japanese technology but designed to meet the demanding conditions in North America. All our products are focused on quality, reliability, and user convenience.
Proven Product Quality
All Inaba Denko America products undergo strict manufacturing control to maintain consistent quality. Each component is designed to perform effectively in varied environments.
Innovative Product Design
Our products are developed with practical features that solve real job-site challenges. From compact profiles to corrosion-resistant materials, every detail is designed to improve efficiency.
Precision Engineering
Developed by Inaba Denko Japan, each metal lineset cover is designed with accuracy and consistency, meeting the highest global standards for HVAC applications.
Extensive Support Network
Inaba Denko America provides technical support and service for distributors, contractors, and installers across North America, making every project more efficient and worry-free.
Best Used for
The Slimduct RD Metal lineset cover is designed for commercial HVAC systems requiring multiple refrigerant line set enclosures. It works perfectly for VRF and VRV multi-split systems in buildings such as hotels, schools, and apartment complexes.
Its metal lineset cover design is best used where curb appeal and long-term durability are equally important. It protects line sets from harsh weather while maintaining a professional look that complements your property.
Ready to Improve Your Next Commercial HVAC Installation?
Check out our Slimduct RD Metal lineset covers to protect and organize refrigerant piping on your commercial property. Connect with experts at Inaba Denko America to request specifications, find a distributor, or plan your next project.
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