Model # INSLV6

Internet #100396953

Store SKU #363913

Store SO SKU #1000684925

null 6 in. Dia R-6 Ductwork Insulation Sleeve

6 in. Dia R-6 Ductwork Insulation Sleeve

$6.45 /each

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Product Overview

Insulate your new or existing 6 in. duct pipe with this Master Flow 6 in. Dia Fiberglass Insulation Ductwork Sleeve. Enjoy consistent air temperature and reduced system condensation and noise. On new pipe installation - simply slide the sleeve over the 6 in. duct pipe as it is being installed. For existing duct pipe up to 6 in. in diameter - cut the jacket length wise (insulation is pre-cut) and wrap around the pipe.

  • Insulates new or existing ductwork to help maintain consistent air temperature in a ventilation system
  • Insulates pipes up to 6 in. in diameter and up to 5 ft. in length
  • R-6 value for effective insulation of your duct system
  • Reduces mold-causing condensation and absorbs draft and duct system noise

Info & Guides

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Customer Questions & Answers

Can you install this after install?

Can this go on after ducts are installed or must they go on before making the connections? In otherwords, must they slide onto the ducts or can they be wrapped?
Asked by: Smitty
You can install these after the ductwork is installed. It takes a little longer, but is designed with this in mind. The insulation has a natural seam - using sharp contractor shears you can cut the sleeve lengthwise along this seam. Then place the insulation over the duct and the sleeve over the insulation. You may wrap 1/2"-1" of the insulation over itself to minimize the air gap without compressing the fiberglass. I try to offset the seam in the insulation with the cut in the sleeve. Once the sleeve is generally in place use foil tape to secure both ends and the middle, then use long sections to seal the remainder of the seam.
Answered by: wbdarby
Date published: 2017-01-08

Where is the 4in. Diameter duct sleeve?

I want the 4 inch sleeve for my 4 inch ductwork from the bathroom fan into my attic (the Maine winter is causing condensation to drip back into the house). I can't find it at anywhere.
Asked by: Hc
It seems that you could use the 6" sleeve if you cut the sleeve down the seam, wrap the insulation over itself (without compressing it) and overlap the sleeve before taping it. It will take a bit longer, but should be doable. I used 6" sleeves on existing ductwork, and slightly wrapped the insulation over itself to reduce the air gap between the insulation and duct.
Answered by: wbdarby
Date published: 2016-09-14

If you can buy 25ft of insulated flexible ducting for $26....why wouldn't a person just buy that ...

If you can buy 25ft of insulated flexible ducting for $26....why wouldn't a person just buy that and remove the inner flex duct and use the insulating sleeve it comes with? I mean seriously...5 feet for 20 bucks?! Maybe I'm missing something?
Asked by: Steve
I'm a nimrod...Scrolled down and was looking at a bundle price package. In any event, those needing longer runs could but the insulated flex pipe and cut the insulation off.
Answered by: steve
Date published: 2017-03-30

Can I install the 6" duct sleeve over a 5" round duct?

Asked by: Engineer1
I would imagine that there would be an air gap between the pipe and insulation. This should reduce the R value and allow condensation to build up. I would cut a strip out to allow the insulation to fit around the pipe closely.
Answered by: Oldducts
Date published: 2016-10-05
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Customer Reviews

6 in. Dia R-6 Ductwork Insulation Sleeve is rated 3.3 out of 5 by 22.
Rated 5 out of 5 by from This duct insulator provided a good solution for cold bare dryer duct (extending several feet int... This duct insulator provided a good solution for cold bare dryer duct (extending several feet into my basement ceiling). I did have to modify sleeve as the dryer duct is 4 in. But no problem, I simply cut a couple of inches off of the diameter over the length of the sleeve (fiberglass only). I did a full wrap over the dryer duct holding the sleeve in place with good old duct tape.
Date published: 2017-01-04
Rated 5 out of 5 by from The ducting for our portable AC unit fit finto duct... The ducting for our portable AC unit fit finto duct sleeve and has allowed for the room to cool down much quicker as it stops the hot air from coming into the room due to the insulation.
Date published: 2017-04-18
Rated 4 out of 5 by from 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.
Date published: 2009-05-06
Rated 2 out of 5 by from 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!
Date published: 2014-12-08
Rated 2 out of 5 by from 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.
Date published: 2013-05-26
Rated 4 out of 5 by from 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.
Date published: 2014-09-19
Rated 1 out of 5 by from Absolutely inferior prooduct This is a total junk and a perfect example of a corporation cutting corners and shorting a consumer. Your get 2 separate pieces: one is fiberglass and the other is some very easy to tear foil-like material, which goes on exterior, the jacket. Both pieces are shorter then advertised. Now, in order to install 5 foot piece, you either need 3 people or a bunch of tape that can stick to fiberglass, because the manufacturer did not glue the two pieces together! So you working alone and wrap your duct with a fiberglass piece first, and used about 60 inch of foil tape to hold it in place! Now you wrap the second piece, the jacket over fiberglass and tape it again - say another 60 inch of expensive foil tape! And if you need to make cuts to get around joists, while draping these pieces over a duct, good luck to you! Total junk.
Date published: 2015-12-20
Rated 2 out of 5 by from 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.
Date published: 2011-12-07
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