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

$8763
  • R8 fiberglass insulation is perfect for heating and A/C systems
  • Galvanized core wire resists rust and corrosion
  • Insulated duct can withstand up to 200°F
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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 200F
  • Always install per instructions and seal using approved mastic or sealant (or approved tape)

Additional Resources

From the Manufacturer

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BrandThermaflexMaster FlowMaster FlowMaster Flow
NameKP 14 in. x 25 ft. HVAC Ducting - R4.26 in. x 25 ft. Insulated Flexible Duct R8 Silver Jacket7 in. x 25 ft. Insulated Flexible Duct R8 Silver Jacket8 in. x 25 ft. Insulated Flexible Duct R8 Silver Jacket
Price
$5150
/box
$8042
$8200
$9455
Ratings
(37)
(305)
(304)
(305)
InsulatedYesYesYesYes
Maximum air flow (CFM)5586100.0150200.0
Product Diameter (in.)14 in678
Insulation R-Value4.2888
MaterialFiberglassFiberglassFiberglassFiberglass
Product Length (in.)300300300300
Product Depth (in.)25300300300
Product Width (in.)1710.511.512.5
Product Height (in.)1710.511.512.5
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Specifications

Dimensions

Product Depth (in.)300Product Diameter (in.)6
Product Height (in.)10.5Product Length (in.)300
Product Width (in.)10.5Wall Thickness (in.)2.25

Details

ColorSilver JacketInsulatedYes
Insulation R-Value8Insulator materialOther
MaterialFiberglassMaximum air flow (CFM)100.0
Returnable90-Day

Warranty / Certifications

Certifications and ListingsETL Listed,UL Recognized

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
  • Is the product easy to use?
  • What are the dimensions of the product?

Customer Reviews

  • 4.8
    out of 305 reviews
  • 93%recommend this product
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Showing 1-10 of 305 reviews
Mislabeled box. 7" duct instead of 6"
I'm not sure what the deal was (if someone switched the label or manufacturing error) but the box I bought had a 6in label on it and the ducting ended up being 7in. Unfortunately, I did figure this out until I dragged the box up into the attic and opened it up. At that point it just wasn't worth it to drag it back out and try to cram it all back in the back (it basically springs out once opened). I made it work, but it was still frustrating and made the project just that much harder. So try and double check the sizing of the ducting before you get too deep.
by
    Decent quality. Wish they had higher R ratings available.
    Decent quality. Wish they had higher R ratings available.
    by
    • Verified Purchase
    • Recommended
    3 found this review helpful
    Easy to install with a screwdriver, knife, and wire cutter (needle nose pliers for the wire in th...
    Easy to install with a screwdriver, knife, and wire cutter (needle nose pliers for the wire in the outer shell). It insulates the inner tube from the cold attic in the winter.
    by
    • Verified Purchase
    • Recommended
    1 found this review helpful
    Product is durable and easy to work with.
    I ordered two. Product is durable and easy to work with.
    by
    • Verified Purchase
    • Recommended
    4 found this review helpful
    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 .
    by
    • Verified Purchase
    • Recommended
    17 found this review helpful
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    • Verified Purchase
    by
    • Verified Purchase
    by
    • Verified Purchase
    Good insulation easy to work with....
    Good insulation easy to work with.
    by
    Response from Master FlowMay 25, 2022
    Thank you for the feedback. Glad you were satisfied with your Master Flow purchase. MasterFlow
    • Verified Purchase
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    • Verified Purchase
    Showing 1-10 of 305 reviews