Lambro 4-in x 240-in Foil Flexible Duct in the Flexible Duct department at Lowes.com
3 Inch 16 Feet Air Duct Flex Air Aluminum Foil Ducting Dryer Vent Hose HVAC | eBay
Proper Way to Vent Bathroom Exhaust Fan? (More Info in Comments) : r/hvacadvice
Amazon.com: iPower 6 inch Inline Booster Fan and 16 Feet Non-Insulated Flex Air Aluminum Ducting Vent Hose for Kitchen Bathroom Grow Tent HVAC Exhaust or Intake : Everything Else
TerraBloom 4 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
Proper Way to Vent Bathroom Exhaust Fan? (More Info in Comments) : r/hvacadvice
Amazon.com: Cuchiilo 5 inch Flexible Duct, 5 inch Duct Hose,Flex Hose 25Feet Long,Aluminum Insulated Ducting,with 2 Duct Clamps,Duct Tape and Gloves,Used for Ventilation Exhaust Bathroom Fan : Appliances
Master Flow 3 in. x 120 in. Aluminum Flex Pipe AF3X120 - The Home Depot
Everbilt 3 in. to 4 in. Plastic Duct to Duct Increaser INC34EHD - The Home Depot