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Best Choice HG Power 
4 Inch Air Duct, HG Power 16 FT Flexible Dryer Vent Hose with 2 Clamps, Three Layer Noise Reducer Aluminum Ducting for D 4 Inch Duct: The HG POWER flexible vent hose is 4 inch in inner diameter, the outer diameter measures 4.3 inch, and comeHon&Guan 
Hon&Guan 6" Air Duct - 16 FT Long, Black Flexible Ducting HVAC Ventilation Air Hose for Grow Tents, Dryer Rooms,Kitchen LOW NOISE SILENCER: designed for reducing noise from fans and carbon filter systems, can decrease the noise by up to 50%HG Power 6 Inch Air Duct, HG Power 16 FT Flexible Dryer Vent Hose with 2 Clamps, Three Layer Noise Reducer Aluminum Ducting for D 6 Inch Duct: The HG POWER flexible vent hose is 6 inch in inner diameter, the outer diameter measures 6.3 inch, and comeBest Value AC INFINITY 
AC Infinity Flexible 4-Inch Aluminum Ducting, Heavy-Duty Four-Layer Protection, 8-Feet Long for Heating Cooling Ventilat Designed for ventilation applications including HVAC, dryer, grow rooms and tents.AcbbMNS 
AcbbMNS 75mm Duct Pipe for Air Diesel Parking Heater Air Outlet Hose, Extendable Aluminum Foil Air Ducting Vent Hose Com Made of high quality aluminum foil materialAcbbMNS 
AcbbMNS 6-Inch 32.8FT Aluminum Foil Ducting Hose, Flexible Ducting HVAC Ventilation Air Hose with 2pcs Clamps for Heatin 【Air Ducting Size】 6 inches (150mm) diameter, 32.8ft (10m) long, with 2 metal clamps.GROZY 
GROZY Guan 6 Inch 150mm Air Ducting Hose Flexible Double Aluminium Foil Ventilation Tube Compatible with Ducted Exhaust High-Quality Aluminum Construction: Crafted from high-quality aluminum, this ducting is resistant to high temperatures aTEAIERXY TEAIERXY 3 Inch 8 Feet Dryer Vent Hose,Flexible Insulated Air Ducting,Diesel Heater Hose PVC Aluminum Foil with 2 Clamps [Material]:The Dryer Vent Hose is made of ( Aluminum Foil + PET +Steel wire+ PVC),The hose steel wire diameter is 1mm prBIGTEDDY 2M 60mm Duct Pipe for Air Diesel Parking Heater Conditioner Ducting Material : AluminumDeflecto Deflecto Semi Rigid Aluminum Duct, 150 mm Diameter x 3 Meter Length Easily connects without the use of clamps, tools or tapeVEVOR VEVOR Diesel Heater Pipe Ducting Set, 3" Extendable Air Duct Hose, 1" Stainless Steel Exhaust Pipe, 2 Air Vents, Tee Air Diesel Heater Pipe Duct Kit: Suitable for 2KW/5KW/8KW diesel heaters, including split type and all-in-one type. 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