Model # INSLV6

Internet #100396953

Store SKU #363913

Store SO SKU #1000684925

null 6 in. Dia R-6 Ductwork Insulation Sleeve
0050206023327

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

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Customer Questions & Answers

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Customer Questions & Answers

6 in. Dia R-6 Ductwork Insulation Sleeve
6 in. Dia R-6 Ductwork Insulation Sleeve

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2 answers

Can you install this after install?

This question is from 6 in. Dia R-6 Ductwork Insulation Sleeve
Asked by
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October 25, 2015
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?
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Answers (2)

Asked by
Nashua, NH
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December 29, 2015
Answer: 
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 Read More
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. Read Less
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October 26, 2015
Answer: 
Thank you for contacting MasterFlow ... The Duct Sleeve, must be installed over the pipe before installation. The Duct Wrap can be applied after the metal pipe has been installed. For more information, please call our Technical Services Group at 800-211-9612, 8A-5P M-F EDT.
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2 answers

Where is the 4in. Diameter duct sleeve?

This question is from 6 in. Dia R-6 Ductwork Insulation Sleeve
Asked by
Bangor, me
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October 3, 2015
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.
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Asked by
Nashua, NH
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December 29, 2015
Answer: 
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.
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October 6, 2015
Answer: 
Thank you for contacting MasterFlow ... The duct sleeve product is not manufactured in the 4 inch size. The 6 inch size will have to be trimmed to fit your 4 inch pipe. Please call Technical Services Group at 800-211-9612, M-F 8A-5P EDT to get any additional information needed.
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1 answer

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

This question is from 6 in. Dia R-6 Ductwork Insulation Sleeve
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July 27, 2016
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Asked by
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October 5, 2016
Answer: 
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.
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1 answer

Are there lengths longer than 5ft available?

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July 27, 2016
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Asked by
Orlando,FL
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Home Improvement Profile: DIYer
July 31, 2016
Answer: 
No but the 5 Foot covered the 5 Foot pipe
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Customer Reviews

6 in. Dia R-6 Ductwork Insulation Sleeve is rated 3.3 out of 5 by 21.
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 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 5 out of 5 by from Worked as planned Very easy to slide over 6 inch. duct , installation was quick and easy to work with.
Date published: 2016-03-29
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 5 out of 5 by from Works good for my needs Some bad reviews on this product... Idk why. Basically what you see in the bag is what you get. It worked well for my needs. I wouldn't want to do a whole house with it- but it would work. There is probably a better product if your doing a lot of insulating. I just needed to do one duct. Also- not the measurement on the package and the difference between radius and diameter. I got the wrong size but still used it.
Date published: 2016-02-23
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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