Hon&Guan Air Duct - 16 FT Long, Black Flexible Ducting HVAC Ventilation Air Hose for Grow Tents, Dryer Rooms,Kitchen (4", 16 FT) : Amazon.com.au: Home Improvement
PVC Plastic Flexible Ventilation Ducting 100mm x 45m Manrose
TerraBloom 6 Inch Aluminum Flex Duct - 25 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