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3X8 RIGIFLEX DUCT CLASS 0Lambro 301 8-Ft. Flexible Semi-Rigid Aluminum Duct (3 In. Diameter)Features of 3X8 RIGIFLEX DUCT CLASS 0 • Airtight design ;• Fire-resistant;• Class 0 air duct;• Improved airflow ;• Highly flexible ;• Installer-friendly ;• Patented;• Uninsulated;• Operating temperature range: -86deg F to 400deg F;• Max. velocity: 5,000 FPM;..