Message to Our Customers

Master Flow

Model # F8IFD4X300

Internet # 202562739

Store SKU # 809916

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

This item has been discontinued.
The Home Depot no longer carries this specific product.

$36.25 /  each


Model # F8IFD4X300

Internet # 202562739

Store SKU # 809916

Store SO SKU # 755578

The Master Flow 4 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 & 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 degrees Fahrenheit
  • 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.) 
4.0 in 
Product Height (in.) 
Product Length (in.) 
300 in 
Product Width (in.) 
Silver Jacket 
Insulator material 
Maximum air flow (CFM) 
R Value 
Warranty / Certifications
Certifications and Listings 
2-UL Recognized,ETL Listed 


Rated 4.0 out of 5 by 2 reviewers.
Rated 4.0 out of 5.0 by Stopped my vents dripping from condensation! Stopped my vents in my bathrooms from leaking. A little pricey but they got the job done. January 13, 2014
Rated 4.0 out of 5.0 by nice product I was looking for a heavy insulated bath fan duct for a vertical replacement in a cold attic that was having sweating problems. This R8 product was the heaviest insulation I could find and it cured the problems. It installs nice - just cut through the insulation and then the vinyl duct - snip the wire - slide the insulation back and clamp the vinyl duct to the pipe - finish. The shipping was fast as well. January 17, 2012
  • 2015-06-01T10:54:32.172-05:00
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