DuraBreeze Duct Defender 8"

I was a little skeptical of this product and initially just got it to try but since then I have bought 5 more for all my duct ends. Prior to this I was just using a woman's panty hose to protect my inline fan from dust and particulates from getting in the duct and breaking/damaging anything! But since using this I have been verry happy and plan on using them for a long time! One of the best features besides the little carbon insert is the fact that it comes with little glued on pieces of velcro so you can make sure that it is securely attached to the ducting and if you ever need to remove it, it can easily be put back on!!