

🛠️ Wrap your ducts in next-level efficiency and style—because your HVAC deserves the best!
This 1.5-inch thick fiberglass duct insulation features a durable foil scrim kraft jacket in silver, measuring 48 inches wide by 25 feet long. With an R-Value of 4.2 and a density of 3/4 lbs, it offers superior thermal protection across a broad temperature range (-32°F to 250°F). Certified to multiple ASTM, UL, and NFPA standards, it ensures professional-grade safety and performance for HVAC systems.
| ASIN | B0099U4RM4 |
| Best Sellers Rank | #28,825 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #7 in Fiberglass Raw Materials |
| Customer Reviews | 4.6 4.6 out of 5 stars (177) |
| Date First Available | March 20, 2013 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.01 ounces |
| Manufacturer | JOHNS MANVILLE |
| Manufacturer Part Number | 670378 |
| Material Type | Fiberglass |
| Product Dimensions | 16 x 15.2 x 48.7 inches |
| UPC | 696333272926 696334303353 |
A**R
Quality duct insulation!!
Quality insulation!!
A**7
Used to Re-insulate 15ft of 9" diameter air duct in attic space. Successful
Seemed like great deal. Used to repair duct work. Came in large box, Wide roll. 3M venture tape went over it and stuck to it well. Easy to cut with fresh razor blade. I would buy this again if the seller can't maintain this competitive price. Otherwise I will have to return to buying it local. Convenient to have Amazon deliver it at this competitive price.
H**.
Easy to work with, fantastic if R rating is correct
Very easy to work with, no concerns just seems less extreme than the pink insulation
D**H
Good Buy
Product came well packaged with no damage. I used it to wrap the exposed ductwork branches from main trunk. The heat discharge temp at the registers has increased by about ten degrees. It is very easy to measure and cut and tape. Wear safety glasses and dust mask if working overhead especially as there is some fiber that that gets loosened when you work with it.
B**E
Wonderful for Insulating the Hose on Whynter Portable Air Conditioner
Wonderful for Insulating the Hose on Whynter Portable Air Conditioner - man, what a HUGE difference! I was wondering why I was feeling heat when I had the A/C on and it was definitely blowing cold air. I went to check the unit and felt heat coming from somewhere. It was the coming through the walls of the exhaust hose. Grrrrr. This insulation wrapped around the hose and secured with metal heat tape does an incredible job of blocking the heat.
E**R
Excellent quality insulation for HVAC project
I needed to air seal and re-insulate my hvac plenum in my attic. I initially bought a roll of FrostKing insulation from Lowe’s, but it was garbage, really weak stuff. However, this stuff is professional grade insulation. The silver backing is tough and reinforced with fiberglass strings, and both foil and cloth tapes adhere to it very well.
R**Y
Doubled up my duct insulation
Doubled up my insulation on my dockwork since it in the attic. Keeps the air cooler when ac turns on
C**G
insulation
Product is exactly as ordered. arrived in great condition and on schedule.
TrustPilot
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