Rated 2.9 out of 5 by 15
Rated 4.0 out of 5.0 by 4everFixnStuf This is a great product
I used 15 rolls of this duct insulation - the 6 and 8 inch - to repair existing ductwork in a very confined crawl space in my 40 YO house. That meant the insulation wrap had to be cut. Here, it is important to have very sharp scissors to prevent snagging and tearing. Other than that, it was very easy even in the limited work space. After cutting the wrap lengthwise, the insulation was laid over the duct, then the wrap was laid over and pulled onto place. Using flexduct tape, put 3 strips - one at each end and one in the middle to make a temporary hold Then ran tape the length of the seam. Simple as that. Installation on new ducts would be even easier since no cutting would be required. The insulation quality is very good and the outer wrap is strong yet very flexible. I highly recommend this for anyone to use and the price was very reasonable. This was my first try at doing the ducts and, for just a diy-er, it went very well.
May 6, 2009
Rated 2.0 out of 5.0 by Diyguy Awkward and tear prone
When I used this two years ago, it consisted of a long rectangular batt of fiberglass insulation curled inside a silvered Mylar sleeve. The Mylar tended to tear and the batt tended to shift. I had better results with the more rugged foil backed product cut to fit and closed with hvac foil tape.
September 10, 2015
Rated 2.0 out of 5.0 by Bruce Much Needed, BUT They Will Short You!
Master Flow is not consistent with product, they are using two different fiberglass mats, a thicker firmer yellow mat and a thinner less firm pink mat insulation! Secondly, the outer aluminumized shell is consistently shorter then the fiberglass mat, which is stupid because you want to overlap outer shell to tape ends together! Thirdly, as the description states "up to five feet" because it is not five feet, they short you up to a half a foot! If you wanted to put up three units, end to end, to reach 15 feet, you will never get there, and need to buy a forth unit!
December 8, 2014
Rated 2.0 out of 5.0 by Diyguy Best for new or disassembled venting
I agree with the previous comments regarding trying to cut and tape this over existing ducting. It probably works pretty well if you can just slide it over a piece of duct before assembly. For retrofit work, I'd suggest buying foil backed batting and cutting to size instead.
May 26, 2013
Rated 4.0 out of 5.0 Used on existing ductwork. Works great.
I been using this for my existing in place 6 inch ductwork. Had to cut the foil wrap lengthwise. Thus laid the fiberglass first on the ductwork and the place the foil wrap on top of that. Like the other reviewer I used foil tape in short pieces to hold together the foil wrap at the ends and middle of pipe to keep it together until I can more fully seal the pipe length. Don't use the cloth duct tape, use the foil tape! Doing it this way made it faster to install but of course in older houses you will encounter the tips of the above flooring nails, which is what the foil wrap at times get caught on as you pull and align it along the pipe. Other than that it was easy to use.
September 19, 2014
Rated 2.0 out of 5.0 by JWS1 Don't do this alone
This product comprises a 6' long tube of aluminum foil, surrounding a sheet of fiberglass wool. To fit to new ducts, you pull the tube over the duct and tape into place prior to installation.
I was in the position of having to fit to existing ducts. Instructions tell you to first secure the foil to the fiberglass with tape, then split the aluminum cover lengthwise; the fiberglass is already split so you're forming a two-layered sheet. Wrap this sheet around the duct and tape it closed.
In practice, I found this to be immensely difficult and frustrating. Does adhesive tape stick to fiberglass wool? Not hardly, so the foil and fiberglass keep coming apart and going separate ways. Like in 99% of houses, my duct-work is in awkward, hard to get at places, so I was at screaming point in no time at all.
My options; 1. wait until I have at least one other pair of hands to help, 2.disassemble the ducts and treat as a new installation, keeping the foil wrapper intact, or 3. return the three unused packets for refund. I'll probably go with #1, but I wish I'd known that fitting to existing ducts is NOT a one-person job before buying the product.
December 7, 2011
Rated 4.0 out of 5.0 by Dutchboy Foil was a little short
The. Foil that goes over the insulation was insufficient to cover the insulation itself.
March 5, 2013
Rated 2.0 out of 5.0 by cybermil duct sleeve
I bought 6 rolls of the 8" to cover my old duct work. I did as one reviewer did and cut the sleeve instead of taking the duct apart. This is not an easy project to do by your self. The foil wrap on the sleeve is very fragile and tears easily. It might be easier to take the duct apart. But if I do my other ducts in the house, I will just tear out the old and use new 8" flexible ducting. Its R8 rated AND cheaper. Live and learn, but for me this product is a never buy it again item.
January 28, 2013