Builder’s Best V320 Semi-Rigid Flexible Aluminum Duct, Crimped/Plain, 4" x 8'

The Builder’s Best V320 Semi-Rigid Flexible Aluminum Duct with one crimped end and one plain end is a non-insulated Class 0 metal duct designed for safe, efficient, and reliable venting in general air supply, return, and exhaust applications. Built for performance and durability, it offers a strong and flexible solution for dryers, exhaust fans, and HVAC systems. Constructed from 100 percent aluminum alloy, the V320 variant is corrugated and spiral-formed with continuous lockseams to ensure strength and maintain shape during installation. This model features a thinner wall than the Builder’s Best V330 duct, providing greater flexibility and easier shaping. The crimped end allows simple joining to compatible fittings or additional duct sections, while the plain end provides a smooth, secure connection on the opposite side. Each duct measures 8 feet in length and ships compressed to 24 inches for compact packaging and easier handling. The V320 variant is rated for positive and negative pressures up to 6 inches water gauge and supports maximum air velocities of 5,000 feet per minute. It operates across a wide temperature range from -100°F to +430°F, offering dependable performance in both cold and high-heat conditions. Meeting Class 0 requirements, the non-combustible aluminum construction achieves a flame speed of 0 and smoke developed value of 0, ensuring compliance with safety standards for metal ducts. Proudly made in the USA, the Builder’s Best V320 Semi-Rigid Flexible Aluminum Duct provides a durable and code-compliant option for residential, commercial, and industrial ventilation systems.

• Semi-rigid aluminum duct with one end crimped and one plain, designed for reliable airflow in dryers, exhaust fans, and HVAC systems
• 100 percent aluminum alloy with continuous lockseams and a thinner wall than standard V330 models for greater flexibility
• 4-inch by 8-foot duct ships compressed to 24 inches for compact packaging and easy storage; expands to full length during installation
• Class 0 non-combustible metal construction withstands heat up to 430 degrees Fahrenheit with zero flame or smoke speed
• Builder’s Best delivers high-quality venting solutions made in the USA, engineered for safety, efficient airflow, and long-lasting durability
• Material: Aluminum
• Color: Silver
• Dimensions (L x W x H): 23.00 x 4.25 x 4.25 inches
• Weight: 0.75 pounds
• Manufacturer warranty: 30-day warranty