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

Name: IMPERIAL 6.0-in x 25.0-ft Polyester Insulated Flexible Duct 6.0 - R
Brand: IMPERIAL
SKU: 50401800
Price: 56.28 USD
Availability: InStock
Rating: 4.7 (418 reviews)

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Multiple Pack Sizes Available

4.7

418

Diameter (Inches): 6.0

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Sat, Oct 3

106 available

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Sat, Oct 3

114 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 6-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)	6	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

418 Reviews

91% Recommend this product

Ratings may include incentivized customer reviews.

Read All Reviews

+ 2

What Customers Are Saying

Customers overwhelmingly praise this flexible insulated duct for superior thermal performance, ease of installation, and durable construction. Most highlight its effective insulation that reduces heat transfer, eliminates condensation, and improves HVAC efficiency. Reviewers consistently note it's lightweight, flexible, and simple to cut and install without specialized tools, with many successfully completing DIY projects. The tough outer layer resists punctures and tearing even in demanding applications like bathroom exhaust or portable AC venting. A few mention wishing shorter lengths were available, but overall customers consider it a reliable, high-value upgrade over older or cheaper alternatives.

Customer review summary generated by AI, including incentivized reviews.

418 Customer Reviews

Sort By

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
Verified Purchaser

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I’m very satisfied I bought this

Me69BSSeptember 20, 2026
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
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

Was this Review Helpful ?

Great product

Would Recommend

Great product

BatmanSeptember 10, 2026
From 5-in x 25.0-ft Polyester Insulated Flexible Duct 6 - R Verified Purchaser

Was this Review Helpful ?

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COMPARE PRODUCTS

		Name	Current Item IMPERIAL6.0-in x 25.0-ft Polyester Insulated Flexible Duct 6.0 - R
		Ratings	417
		Diameter (Inches)	6
		Type	Flexible
		Insulated
Rubber-Cal8-in x 25.0-ft Aluminum Insulated Flexible Duct 4 - R	IMPERIAL6.0-in x 25.0-ft Polyester Insulated Flexible Duct 8.0 - R	IMPERIAL12.0-in x 25.0-ft Polyester Insulated Flexible Duct 4.2 - R	IMPERIAL8.0-in x 25.0-ft Polyester Insulated Flexible Duct 8.0 - R	IMPERIAL12.0-in x 25.0-ft Polyester Insulated Flexible Duct 8.0 - R	IMPERIAL14-in x 25.0-ft Polyester Insulated Flexible Duct 8 - R	IMPERIAL14.0-in x 25.0-ft Polyester Insulated Flexible Duct 4.2 - R	IMPERIAL4.0-in x 25.0-ft Polyester Insulated Flexible Duct 8.0 - R	IMPERIAL10.0-in x 25.0-ft Polyester Insulated Flexible Duct 8.0 - R
	103	26	103	103	103	26	103	103
8	6	12	8	12	14	14	4	10
Flexible	Flexible	Flexible	Flexible	Flexible	Flexible	Flexible	Flexible	Flexible