The “Tornado-Flex Large Diameter” flexible ducting is a single-ply PVC vinyl coated polyester fabric hose reinforced with a spring steel wire helix & external PVC wearstrip. This large diameter duct’s wall is a PVC coated fabric that is built around steel wire. Since Polyvinyl Chloride is a highly flexible material, this large diameter flexible ducting inherits the characteristics of PVC’s material makeup. This flexibility and compressibility is not at the price of losing flex-fatigue. This hose will not wear or rip from it being continuously flexed during use and exhibits excellent life even when constantly moved. PVC coated fabric ducts can be continuously contracted and relocated without triggering injury or weakening the hose. this makes “Tornado-Flex Large Diameter” ducts an ideal hose for applications, like portable air conditioners or field tent ventilation and HVAC.
The “Tornado-Flex Large Diameter” is available in 20, 24, 28, 30, 36, 40, 42, and 48-Inch I.D. and custom sizes up to 52″ diameter. This hose can be purchased in lengths up to fifty feet in most diameter sizes. This large diameter flex duct is recommended for air ventilation, HVAC, chillers, and general air movement. The standard color for the hose is Yellow (with a black wearstrip), however it can be purchased in custom military colors like olive drab, desert tan, blue and white. This hose is listed as UL 94 V-0 flame retardant and is manufactured with materials that meet NFPA 701 standards. A flexible duct that complies with NFPA 701 is one that shall be considered a noncombustible material. “The material, in the form in which it is used, and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors when subjected to fire or heat.”
Since this flex duct is made from PVC, it is lightweight and easy to move. A 24-inch diameter version of this duct weighs about 1.4lbs per foot, hence a 20 foot length hose would only weigh about 28lbs. In addition, it is highly compressible, with a compression ratio of 11 to one. And the same 20 foot section noted, can be compressed into a roughly two foot section. Its lightweight and highly compressible nature allows for it to be moved and reinstalled comfortably. This hose can be purchased in a multitude of ends. Reducing and or an enlarging end cuffs, longer standard cuffs, and funnel cuffs are available upon request. The access to custom ends permits operators to install hoses to machinery and fans without the need for customizing the equipment’s end connections. Since each hose is made to order, it can be ordered with specific lengths, end cuffs (for each end) and color.
Volume Pricing
| Pricing per Foot | 25 – 99 feet | 100 – 249 feet | 250 – 499 feet | 500+ feet | |
| 28” ID | $73.89 | $64.29 | $60.96 | $55.42 | |
| 30” ID | $84.15 | $73.21 | $69.42 | $63.11 | |
| 36″ ID | $100.93 | $87.80 | $83.26 | $75.69 | |
| 40” ID | $135.63 | $118.00 | $111.89 | $101.72 | |
| 42” ID | $144.16 | $125.41 | $118.93 | $108.12 | |
| 48” ID | $161.18 | $140.22 | $132.97 | $120.88 |
See Our Flexible Ducting in Action
Tornado Flex
Tornado Flex Insulated
Expert's Review
Our Expert’s Opinion
Robert, an experienced team member, has this to say
Pros
Large ID Sizes: 20, 24, 28, 30, 36, 40, 42, and 48-Inch ID
Superior Quality: Made in the USA
Flame Retardant: Duct will not burn unless a fuel source is present
UL Listed: UL 94V-0 Flame Retardant
Military: Colors available for military applications – Dessert Tan & Olive Drab
Super Compressible Duct
Cons
Long Lead Time: 4 to 6 weeks
Only for blower applications
Better Options: Neoprene coated hoses are better quality
Less Expensive Options: The “Air Ventilators” are far less expensive
Other options are stocked
WARNING: Cancer and Reproductive Harm - 
