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muctamo

4 Inch 25 Feet R4.2 Insulated Flexible Duct | High-Efficiency Thermal Insulation | Suitable for Heating & Cooling

  • Based on 85 reviews
Condition: New
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$35.99 Why this price?

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Availability: In Stock.
Fulfilled by Amazon
Arrives Thursday, Sep 10
Order within 16 hours and 14 minutes
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Style: 4 IN 25 FT(R4.2)


Features

  • Versatile Thermal Insulation: R4.2 high-density insulation material effectively prevents heat loss and cold air penetration, ideal for HVAC systems, hot water pipes, and cooling systems, suitable for year-round use.
  • Indoor & Outdoor Durability: Weather-resistant outer layer protects against extreme temperatures and UV exposure, perfect for outdoor or damp environments like garages, rooftops, and basements.
  • Easy Installation: Flexible and lightweight, can be easily cut and bent to fit various pipe sizes (4-inch/6-inch options available). No specialized tools required for quick setup.
  • Cost-Effective Solution: High-quality Chinese manufacturing with a durable, thickened structure that resists compression and tearing, offering long-lasting performance with reliable after-sales support.

Material: Fiberglass


Brand: muctamo


Item Thickness: 2 inches


Recommended Uses For Product: Thermal Insulation, Pipe Insulation


Product Dimensions: 4"W


Brand Name: muctamo


Manufacturer: muctamo


Unit Count: 1 Count


Manufacturer Part Number: Muctamo-R4-4-25


Item Thickness: 2 inches


Item Dimensions L x W: 4"W


Coverage: 25.13 square feet, R4.2


Recommended Uses For Product: Thermal Insulation, Pipe Insulation


Material Type: Fiberglass


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Sep 10

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Great price, good product
Style: 4 IN 25 FT(R4.2)
Great for a bathroom fan in attic. Easy to use.
Reviewed in the United States on June 28, 2026 by Steven Barnyak
    • Item as described and felt a high quality
Style: 4 IN 25 FT(R4.2)
Item as described, came in a well packed box and was easy to install.
Reviewed in the United States on December 30, 2025 by Buyer
    • It is what it is.
Style: 4 IN 25 FT(R4.2)
Seems to do the job well. Pretty easy to work with.
Reviewed in the United States on April 15, 2026 by Kuroyuki
    • good price
Style: 4 IN 25 FT(R4.2)
installed
Reviewed in the United States on May 20, 2026 by James Trotta
    • Just what I wanted
Style: 4 IN 25 FT(R4.2)
They do a good job compressing the ducts into a small package for shipping. It's not like there's a large variation in what you're getting, so a little touch like that is the only thing to set it apart.
Reviewed in the United States on April 14, 2026 by Jacob W.
    • worked well
Style: 4 IN 25 FT(R4.2)
This 4" vent worked well. I had no problems with size or strength of the materials. The material under the insulation is thin, but not too thin to work with. I did not notice much working difference between this and similar material I bought at my local big-box store for much more $.
Reviewed in the United States on November 1, 2025 by Robert
    • Easy to install
Style: 4 IN 25 FT(R4.2)
Great insulated flex exhaust duct for my project. Used this in attic space exhausting two bathroom fans. Easy to install. Need a good wire cutter to cut through wire ribbing.
Reviewed in the United States on September 5, 2025 by PS
    • Works for bathroom vent
Style: 4 IN 25 FT(R4.2)
Works as advertised. Used to vent a bathroom vent and it worked as intended.
Reviewed in the United States on December 7, 2025 by maggie beswick

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