This 100% aluminum alloy semi-rigid duct holds its shape better than flexible foil duct, reducing airflow restriction. Ships compressed to 23" and extends to a full 8 feet. Includes two metal clamps for secure connections at both ends.

• 4" diameter x 8 ft length - 100% aluminum alloy construction
• Class 0 non-combustible rating (zero flame speed, zero smoke)
• Temperature range: -100 to +430 degrees F
• Max air velocity: 5,000 FPM at 6" water gauge
• Includes 2 metal clamps - plain ends fit standard 4" fittings
• Ideal for dryer venting, bathroom exhaust, and HVAC supply/return