Hon&Guan 4 Inch Insulated Flexible Duct - 4 FT Noise Reducer Heavy-Duty Four Layer Protection Hose, Insulated Duct for Exhaust Fan Insulation, Heating & Cooling Ventilation, Black

Purchased for a portable AC exhaust hose replacement. Works GREAT! Gets barely warm to the touch, when the old exhaust hose was extremely hot and radiating heat back into the room. AC is a little quieter too. Can't recommend this insulated duct highly enough, I can't believe I had been undermining my AC's efficiency for years with a non-insulated exhaust duct.The duct itself feels very well-made, each end has a short length of reinforced foil which fits under the included hose clamps perfectly. Insulated outer duct begins a few inches later, and the outer duct material feels very durable and flexible. The inner duct acts as the support and the outer duct holds the insulation in place, and the result is a dramatic drop in outer duct temp. AC has been running for a few hours now the outer duct is no hotter. I think we have a winner.

Product does as advertised! Dramatically reduced the amount of heat radiating into the room compared to old hose. While noticablely quiter, not a significant noise reduction. Used on a ocean breeze 12000 btu portable ac unit. Was able to make work with origanal fittings. Quality product at a reasonable price!

Decent duct tubing. Diameter could be slightly larger.

Stellar product!!! Really nice quality and reduces sound.

The stock hoses for my portable (two-hose!) air conditioner had disintegrated, and I've long been considering buying a set of insulated hoses for it ever since I bought the unit.I'm honestly surprised that they were not insulated at all out of the box.As such, I bought two of these hoses in 6"x8'.Installing them onto the original hose adapters was a bit of a task, entailing very liberal application of duct tape.This done, I connected them up and powered the unit up.I did not buy these hoses with the intent of being quiet, but I was honestly and pleasantly surprised by how much quieter the condenser side fan was now. I can barely hear it anymore, and it quickly subsides under the sound of the compressor once pressure builds. With the original hoses, it was easily the loudest part of the entire air conditioner.I cannot measure the thermal performance directly versus the original hoses, due to the original hoses having disintegrated years ago as of me writing this review.However, I can definitely say that, before, it was actually hot behind the unit. With these, it's significantly cooler, and the unit's performance has significantly improved. It can now actually cool my garage! Something it used to struggle with.The hoses have also survived from a durability standpoint significantly better than the original plastic hoses. Although they ARE a little less convenient to store when the air conditioner's not in use thanks to their bulk. That's the only "negative", other than the admittedly improvised installation, that I can even say about them.Final Answer:If you have a portable air conditioner and use it with any regularity, upgrade it to insulated hose(s) now. You will not regret it.

This cannot be used as a moisture vent for a bathroom as the seller claims, as condensation will get between the inner tube and the outer tube in the insulation, and will not likely exit before making a hell of a mold population. From what I understand they make it this way so sound waves enter the insulation, but it really should have a disclaimer that this is not for high moisture applications.

I bought a different insulated vent hose, by the same company, it worked well, but it did not provide the insulation I had hoped for. This one has a noticable impact on radiating heat, as well as noise. The latter was a surprise bonus, that I did not know about. To be honest, the unit seamed fairly quiet, now it is quiet. I have a 4” exhaust on the unit, and just used a reducer coupler, to make 4”. The additional 2” takes more room, but removes more hot air.** I later added a Infinity in line exhaust fan, to help pull the hot air out through the vent. Adding the fan had the greatest impact on any heat the insulation missed. They make them in variable speeds, and they are priced reasonably. I have a 2 degree difference from air temp to hose temp now.

Wow couldn't say Anything Bad about it. Have the 6inch in a 5x5 and man does it work nice. Also picked up the rubber boot strap clamps and did not use the regular ones that come with the product. The Value was great on black Friday week. Was Easy to install, Durability is great. It Fitted nicely in the 5x5 and would Recommend to anyone !! A / OK 👍 👌