Delta Duct FD4-RN – Reinforced Insulated Flexible Duct

The Delta Duct FD4-RN is a premium reinforced insulated flexible duct developed for high-performance HVAC systems that require superior strength, thermal efficiency, and durability. It combines the excellent thermal insulation of the FD4 series with an extra reinforced outer jacket (RN Type) for enhanced protection against tearing, impact, and environmental exposure.

Engineered for commercial, industrial, and residential air conditioning and ventilation applications, the FD4-RN ensures quiet operation, excellent airflow, and long-lasting reliability, even under demanding installation conditions.

Construction & Design

The FD4-RN features a triple-layer construction designed for high thermal efficiency and mechanical resilience:

• Inner Core: Double-layer aluminum/polyester laminate, permanently bonded with flame-retardant adhesive to a high-tensile steel wire helix ensuring airtightness and flexibility.
• Insulation Layer: Premium glass wool insulation (available in 16, 24, or 32 kg/m³ densities) that minimizes heat transfer and system energy loss.
• Outer Jacket (RN Type): Heavy-duty reinforced metalized polyester with a protective mesh layer, providing exceptional tear resistance, UV stability, and mechanical strength for long-term performance.

Key Features

• Reinforced Outer Jacket (RN Type) – Enhanced durability against mechanical damage, wear, and abrasion.
• Superior Thermal Insulation – High-density fiberglass ensures energy efficiency and consistent air temperature.
• Fire-Resistant Construction – Manufactured using flame-retardant materials to meet HVAC safety standards.
• Smooth, Airtight Inner Core – Reduces pressure loss and improves airflow performance.
• Corrosion, Moisture & Mold Resistant – Ensures long duct life and hygienic air distribution.
• Highly Flexible & Easy to Install – Lightweight and adaptable for confined spaces or complex routing.
• Maintenance-Free Operation – Long-lasting performance under continuous air-handling conditions.

Technical Specifications

• Diameter: 4” – 20”
• Insulation Density: 16, 24, or 32 kg/m³
• Insulation Thickness: 25 mm
• Length: 25 feet
• Maximum Velocity: 5000 FPM (25.5 m/s)
• Maximum Positive Pressure: 10” W.C. (2.5 KPa)
• Maximum Negative Pressure: ½” W.C. (0.12 KPa)
• Insulation R-Value: 4.2 or 6 (F·hr/BTU)

Applications

The Delta Duct FD4-RN is ideal for installations that demand both thermal performance and reinforced durability, including:

• Commercial air-conditioning and ventilation ducts
• Industrial HVAC systems exposed to mechanical stress
• Outdoor duct runs and plant rooms
• High-traffic service areas and ceiling voids
• Energy-efficient air distribution systems

Certifications & Compliance

• Manufactured under ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018 standards
• Conforms to international HVAC and fire safety specifications
• Produced by Delta Duct Air Conditioning L.L.C., UAE