at under $40, this 25' flexible duct was good value for something we will not need after we finish our current restoration projectthe material feels strong enough, the coils and stitching sturdy enough for the intended use. it is a bit heavy (like the heavier fiber renforced plastic tarps), so it will sag to the floor if not supported (thus the attached d-rings and included hooks.) we just propped it up in a crate and it stays putthe opening is larger than 8" but not too large. it easily fits on the 8" outlet of our air scrubber but can be tightened snugly. we chose not to try to seal it with the attached drawstring. instead, we bought a vivosun stainless steel air ducting clamp (8") here on amazon and it was pretty simple to get a secure, tight seal the first time we triedalready using this and very happy with our purchase!
Oswaldo nunez 
