Product review (4 stars): Great tubing for use in an attic, strong chemical smell, tears easily
This tubing works very well for bathroom exhaust fans, but I wouldn't use it anywhere where it will be delivering air INTO a living space. The chemical smell of this tubing is extremely strong and unpleasant. Just opening the package fills the room with an intense chemical smell. The smell dissipates after a while, and does eventually go away entirely, but initially when you open it, it's very strong.

So as long as you're using this to take air OUT of a living space, like with an exhaust fan, you'll be fine. I wouldn't use it to channel air into a living space, or use it for anything else where the duct will be inside an occupied space for any length of time.

This tubing is also fairly flimsy and tears easily. As long as you install it carefully, it'll work fine for a long time, But if you have to maneuver and pull it through tight spaces, do so carefully, as it will probably tear somewhere along the way.

Overall, this is the cheapest way to get 20 feet of tubing, so it's hard to complain. The chemical smell is a potential problem, but when used for ventilation in an attic, it's not an issue. Make sure your use is appropriate for this product, and you'll be fine.