Master Flow

Model # F8IFD6X300

Internet # 202562740

Store SKU # 810991

Store SO SKU # 755578

6 in. x 25 ft. Insulated Flexible Duct R8 Silver Jacket

$39.55 /each

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Product Overview

The Master Flow 6 in. x 25 ft. Insulated Flexible Duct R8 Silver Jacket is used in standard Heating and Air Conditioning (HVAC) systems and some venting applications. The duct has R8 insulation which contains 50% more insulation than the standard R4.2 product. This additional insulation provides greater thermal efficiency to save energy. The product is also covered in a heavy duty, silver jacket for durability. The duct is ETL listed, meeting the UL181 standard.

  • R8 fiberglass insulation for greater insulating power
  • Flexible duct is convenient for use in multiple applications including heating and A/C systems and some venting
  • Oversized core to connect quickly and easily to standard sheet metal fitting
  • Galvanized core wire for greater corrosion resistance vs. non-galvanized wire
  • Duct can be cut to length as needed
  • Insulated duct features a maximum temperature rating of 200°F
  • Always install per instructions and seal using approved mastic or sealant (or approved tape)

Info & Guides

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Product Depth (in.) 
Product Diameter (in.) 
6.0 in 
Product Height (in.) 
Product Length (in.) 
300 in 
Product Width (in.) 


Silver Jacket 
Insulation R-Value 
Insulator material 
Maximum air flow (CFM) 

Warranty / Certifications

Certifications and Listings 
2-UL Recognized,ETL Listed 

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Customer Questions & Answers

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Customer Questions & Answers

6 in. x 25 ft. Insulated Flexible Duct R8 Silver Jacket
6 in. x 25 ft. Insulated Flexible Duct R8 Silver Jacket

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Why is maximum air flow so low?

This question is from 6 in. x 25 ft. Insulated Flexible Duct R8 Silver Jacket
March 25, 2016
Why is the maximum air flow listed at only 100cfm?
At what pressure did you get that 100cfm figure?
0out of 0found this question helpful.
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Customer Reviews

Rated 4.8 out of 5 by 5 reviewers.
Rated 5.0 out of 5.0 by Product is durable and easy to work with. I ordered two. Product is durable and easy to work with. After shaking and pulling, both were 22 ft long not 25 ft. I really missed the extra 6 feet but made it work. I got 2 10" also both were 25ft. Tip:I recycled all the insulation from the old flex duct . June 13, 2011
Rated 4.0 out of 5.0 by Flexible duct You have to be extremely careful when installing this flex duct through a tight-fit opening, as the outer vapour barrier could rip easily. It looks strong, but will not tolerate too much of a pull. I ripped mine when guiding it through an opening in a gypsum board wall which does not have very sharp edges. June 24, 2014
Rated 5.0 out of 5.0 by Re-placed metal ductwork This was ordered on-line for pick-up at local store so i would be sure to get the right product even through they had in available. Service was good and followed up with email telling me it was ready for pickup before I was ready! It replaced an old metal duct I needed for a vent in the kitchen that was covered over with a new floor by mistake. I felt great pride in being able to still be able to crawl around in my crawl-space at 62 and hook this up with no problem. December 6, 2011
Rated 5.0 out of 5.0 by Replaced Flex ductwork The insulated Flex Duct worked out just fine. I had a lot of leakage in the piece I replaced. February 3, 2014
Rated 5.0 out of 5.0 by Great duct Easy to install, Works like it's suppost to. Not to heavy to drag around under a house. May 7, 2013
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