Dundas Jafine Insulated Flexible Duct with Black Jacket, 4-Inches by 25-Feet BPC425R6

best quality product for bathroom vent duct.

This is one of those products that i honestly don’t understand why it cannot be picked up at a Lowe’s or Home Depot for less money. The fact is from my use of the product, not only is buying this product less expensive at Amazon, this product is also of superior quality to that stocked locally.I replaced the original bath fans that had previously just vented into the attic. I was looking for something that would prevent condensation, mold or mildew. Pretty much this is the perfect solution. I bought 50!feet of duct, a “y”, and a few other odds and ends from amazon and ties both bathroom fans in one are of our house to duct work and then to a newly created vent in the gable.At the joint in two 25’ rolls I tried several different types of tape, nothing really worked like I wanted it to. I remember I had a roll of 4” Agri tape (AgriDrain Amazing Tape 4 inch by... https://www.amazon.com/dp/B07QLP24HY?ref=ppx_pop_mob_ap_share) and it worked better than I could have ever hoped. Make sure to also get a 4” galvanized or aluminum connector piece if you need to join two rolls. Also, depending on how you are supporting it 24” zip ties can work, but 36” assure that you will not have any problems. After connecting both fans and going to the end of the 50’ of this product as well as 8’ of spiral duct connecting racy bath fan to this trunk, i could not get over the positive pressure i felt when running one of the fans.Will it add money to our house, NO, will anybody but me care, NO, but our home will be improved nonetheless. So often i find myself doing these little things that i don’t think make a hill of beans difference, but after a while i do think there is some cumulative effect, some intrinsic benefit that makes life in the house better. After having both of our sons back for almost 5 months during the quarantine, i can tell you that the long hot showers that college kids take don’t seem nearly so bothersome, or steamy.

These were perfect for all my bathroom exhaust vents.

Used it to install a inline bathroom fan. Worked well. Used scissors to cut through the plastic outer coating, fiberglass insulation and inner plastic duct. Then used snips to cut the wire. The thickness of the duct seams adequate and appears to be durable. I was tugging on it to get it to come out of the insulation a little bit more and it never ripped. I would choose this product again.

I'll be honest I was astonished at some of the prices of R6 duct. And this one was the cheapest that didn't seem like complete trash. And that's about the size of it. The actual duct is cellophane like a cigarette pack wrapper which seems awfully cheap and chintzy. Cellophane is fairly durable in terms of tensile strength... unless one little rip or tear gets started, then it rips literally easier than paper. And it melts at a very low temperature. So not impressed at all with that and it seems like literally the cheapest crap to make a duct out of that might hold together long enough to get it installed. And the fiberglass insulation was in fair shape for half the length and a wadded up mess the other half. Luckily I only needed a bit less than half so I was good there. The wadded up insulation was probably due to the way it was packed (compressing the duct like a spring as it's stuffed into a box) and I don't know how you could get around that without it being 10x the shipping size. And I mean the air gap is the main insulating factor so it was probably still mostly R6 and still usable in all reality. The outer cover is like a mid heaviness garbage bag type plastic which seems perfectly acceptable to hold the fiberglass insulation on the duct. So all in all not super impressive, especially the cellophane duct part, but cheap (comparatively speaking) and just good enough to be tolerable. Also I didn't hear any crinkling as the air went through it like another reviewer posted. Seems like if you did have that issue you could maybe, probably, resolve it by putting a little twisting tension on the duct to get any loose or floppy spots out of the cellophane?

Used this to run the output of a window air conditioner above suspended ceiling across the basement to an interior bedroom with no windows. I had to add a 6 inch in line duct fan just after the air collection box from the output of the air conditioner, then a 6 inch to 4 inch reducer, then this hose to the bedroom ceiling mounted vent. While it is just on the edge of being too small, it does get enough cooled air into the bedroom that it maintains a comfortable level. The 4 inch size made it easier to run above the ceiling, I *might* have squeezed the next size up into the space but it would have been much more difficult. Overall, the end result is that the problem of no AC in the bedroom was resolved, so I am happy.

I don't know how they will hold up over time, but the wire supported plastic inside and plastic lined insulated outside installed easily and seem fine so far. Still, here in moist Seattle with a chilly house, it is difficult to avoid drippy bathroom vents. These were installed mid Spring, so I won't know if it did the trick until next fall winter.

I was adding 2 bathroom exhaust fans I realized I needed 4 inch insulated ducting and this fit perfect! I was able to use the one roll of 25ft to setup the vents in each of my bathrooms to run outside with no worries about moisture building up in my attic or along an uninsulated hose.