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IMPERIAL 12.0-in x 25.0-ft Polyester Insulated Flexible Duct 6.0 - R

Name: IMPERIAL 12.0-in x 25.0-ft Polyester Insulated Flexible Duct 6.0 - R
Brand: IMPERIAL
SKU: 50401806
Price: 115 USD
Availability: InStock
Rating: 4.7 (419 reviews)

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4.7

419

Diameter (Inches): 12.0

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Wed, Oct 7

67 available

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Thu, Oct 8

68 available

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This Imperial Duct Insulation Sleeve works as an energy-efficient insulation blanket suitable for heating, ventilation, and air conditioning systems. Specifically designed to insulate rigid or semi-rigid round ducts, it is an excellent method for reducing heat or cool loss and condensation build-up. The sleeve is made of a thick fiberglass insulation blanket enclosed in a strong, fiberglass-reinforced silver metalized outer jacket. The insulation sleeve measures 12-in x 25-ft, meets UL 181 standards for Class 1 Air Duct, and features an energy-efficient insulation R-value of 6.0. Check your local building codes prior to installation.

Insulation blanket designed for insulating rigid or semi-rigid round ducts
Suitable for use with heating, ventilation, and air conditioning systems
Helps reduce heat or cool loss and condensation for energy efficiency
Meets UL 181 Class 1 Air Duct standards
Thick fiberglass insulation blanket
Heavy-duty silver metalized outer jacket
Fiberglass insulation R-value: 6.0

General
Color/Finish Family	Silver	Insulation Material	Fiberglass
Type	Flexible	Duct Material	Polyester

Dimensions
Diameter (Inches)	12	Maximum Length (Feet)	25

Features
Insulated	Yes

Certifications
CA Residents: Prop 65 Warning(s)	No	Safety Listing	UL safety listing
R Value	6

Warranty
Warranty	1-year limited

Miscellaneous
UNSPSC	72151200

Check out the Best Selling Flexible Duct on Lowes.com

Review

4.7 out of 5

419 Reviews

91% Recommend this product

Ratings may include incentivized customer reviews.

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+ 2

What Customers Are Saying

Customers overwhelmingly praise this flexible insulated duct for superior thermal performance and ease of installation. Most highlight the R6-rated fiberglass insulation and improved mylar wrap for eliminating condensation, reducing energy loss, and improving HVAC efficiency in cold climates. Many emphasize how simple it is to cut, trim, and route around obstacles, with several completing DIY installations without professional help. Reviewers consistently report it outperforms old or damaged ductwork as a reliable long-term replacement. A few note the outer plastic layer tears easily and mention missing clamps, though these are viewed as minor inconveniences. Overall, customers strongly recommend it for energy savings and durability.

Customer review summary generated by AI, including incentivized reviews.

419 Customer Reviews

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Easy Install and Adequate Installation Thickness

First t8me we've had to purchase an a/c duct. Insulation was a good thickness, easy to install and fair price.

TripinTrish TXOctober 2, 2026
Verified Purchaser

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Flexible product

Would Recommend

I stalled in a crawl space, working with the material was easy. Trimming to size and working with the jacket over joints went well. Just have to be careful of the wire in the inner tube when cutting to size.

NickSeptember 25, 2026
From 6.0-in x 25.0-ft Polyester Insulated Flexible Duct 6.0 - R Verified Purchaser

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I’m very satisfied I bought this

Me69BSSeptember 20, 2026
From 6.0-in x 25.0-ft Polyester Insulated Flexible Duct 6.0 - R Verified Purchaser

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Pretty good

Seems to be pretty good. The thin plastic is surprisingly strong for being so thin. The only issue I have with it is that it can be difficult to slip over the duct boot ends, especially if located in a tough to reach spot,

SelfSeptember 19, 2026
From 6.0-in x 25.0-ft Polyester Insulated Flexible Duct 6.0 - R Verified Purchaser

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Got the job done ✔️

Great product,.

HeckSeptember 10, 2026
From 8.0-in x 25.0-ft Polyester Insulated Flexible Duct 6.0 - R Verified Purchaser

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