Call us 7 days a week


Know exactly what you want?

Save time with this quick order form. If you know the catalog/part numbers for the items you wish to purchase, enter them into your cart here. You can also browse the site and add items to your cart from any product page.

Quick Order

Item NumberQuantity
Return to Category List
S-Tl Thermaflex Flexible Hvac Duct - 20 Inch Diameter
See all 14 items in product family

S-Tl Thermaflex Flexible Hvac Duct - 20 Inch Diameter

Item #: WBB35640

Sold By:

Ships same day. Estimated lead times do not include weekends or holidays. Transit time is determined by shipping method and destination. Orders requiring credit information might take additional time.

Price: $ 99.95
Product Information
Customer Review
Product Q&A
Thermaflex S-TL, non-insulated HVAC ducts are ideal for residential dryers, bathroom applications, cleaning rooms and other areas where insulated ducts are not required.

These flex ducts are for low to high pressure heating and cooling systems. They feature a heavy duty fiberglass cloth fabric that is bonded to a corrosion resistant spring steel wire coil for long lasting durability. Ducts will not unravel when cut and have a self-extinguishing inner core that will not support flames. Temperature range is from -20F to 250F. Ducts measure 2-20" in diameter. Greenguard certified. 10 Year Limited Warranty.

Product Specifications

    • BRANDThermaflex
    • COLORGray
    • TYPES-TL
    • MANUFACTURER'S PART NUMBER0526-2000-0002-10

Avg. Customer Rating: (5 customer reviews)

Write your own review

The most favorable review

  • Customer Rating

The most critical review

  • Customer Rating

Passable for Fixed Installation

Cheap compared to robust HVAC ducts that can be used in multiple locations. NOTE: slanted review by Global as lowest rating is FAIR. Really? The worst product possible is fair?

See more critical reviews

Sort by: 
1 ...

5 Results

Passable for Fixed Installation

Your review: OK for a very fixed installation inside. It is NOT suitable for for anything that requires the ducts to survive sunlight or movement. Sun will destroy this product.

Pros: Cheap compared to robust HVAC ducts that can be used in multiple locations. NOTE: slanted review by Global as lowest rating is FAIR. Really? The worst product possible is fair?

Cons: Sunlight will destroy this product leaving only a skeleton of wire. NOT good for outdoor use. NOT good for over a short time. Ducts were not good for outdoor use on 3 locations before they deteriorated. Indoor and fixed locations only.

Is this review helpful?

pretty good!

Your review: I needed duct to run the air from my whole house fan outside. It was quite a project for a 70 year old woman. And it took me a couple of days to do it. I like the quality of the product. It was important that it could be used with a lot of heat and with my 4700 air flow. Very happy I found something. Thanks

Pros: Hard to find a size that would fit my 18 1/2" diameter fan and the material I needed.

Cons: I was being careful but the wire started unraveling fairly easily. Could be my lack of experience.

Is this review helpful?

Flexible Duct

Your review: Great product. Heavy duty material. Fast shipping.

Is this review helpful?

HVAC Duct 20 inch

Your review: Excellent product and great price. I used it to hook up a ventilation system for my paint booth. Exactly what I needed via Global Industrial as I couldn't get the same product locally or at the best price.

Is this review helpful?

Happy Overall.

Your review: I felt the price was slightly high and I would like to see a discount for buying in bulk, but overall I am impressed and would certainly order again. Thank you for making my order experience positive.

Is this review helpful?

Sort by: 
1 ...

5 Results

Be the First to Ask a Question!