TerraBloom 8 Inch Aluminum Flex Duct - 8 FT Long, Flexible Ducting with 2 Clamps, 3 Layer HVAC Ventilation Air Hose - Great for Dryer, Grow Tent, Green Houses, Household HVAC Venting - Amazon.com
Master Flow 5 in. x 2 ft. Round Metal Duct Pipe BCP5X24 - The Home Depot
4" Inch Flexible Aluminum Ducting Hose Insulated R-8.0 Air Duct Pipe for for Heavy Duty HVAC & Exhaust Ductwork Insulation - 25' Feet Long - Amazon.com