6 x 8-Inch 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;• 6-in. diameter;