5 Inch 25 Feet Insulated Flexible Duct R4.2,5 Inch Insulated Flexible Duct,5 Insulated Flexible Duct,5 Flexible Duct,5 Insulated Duct,for Heating and Air Conditioning HVAC Systems

The inner "foil" layer was much tougher than another reviewer said. It's more of a "mylar" plastic silver mirror kind of material. I only needed 15 to 17 feet, so I didn't mind ruining the end I attached to a rope for pulling through the hordes of black widows and rattlers. The insulation is as expected. I did tear the outer layer just a tiny bit pulling it with a rope I'd fish-taped through a confined crawlspace trench I had to hand-excavate. Attaching it firmly to the flanges worked well however the Hose Clamp, or Radiator Clamp style items supplied were some metric size I had no socket bit for. So, picture a guy on his back in dirt with spider webs hanging down trying to use a flathead driver on his drill to tighten a long long long clamp. One spider said: Hey, how-ya-doin?" I have patience. I attached it to one flange from inside the home, the other from underneath. Both ends were easier than expected. This is a quality product, but fragile as you might imagine. Be careful of it and it's tough enough and a good value.

Used for an additional duct line. Works just fine

Needed to extend a register in the basement and this worked for the purpose. Much cheaper than alternatives, but the material is a little think and tears easier than a name brand product. Worked for my purpose, but just be careful when slipping over the fitting.

Fit:As advertised

Was very well made and at a good price. Had extra so sent this one back.

Works as advertised

Easy to cut to size and install -

Poorly designed duct let nasty insulation into your ductwork. Not good.