Product review (2 stars): Buy Lint Eater instead.
Buy the Gardus Lint Eater instead chuck it into a drill and feed it in. The reach of the duct brush is limiting to me since I need about 20' to get the entire duct cleaned, and it is not very easily used. The Lint Eater can have extensions added to make it as long as you need. The black corigated Lint trap attatchment doesn't fit my shop vac, but the bigger issue was that it was folded so tightly in thee places to fit in the packaging that it cracked, so it had air leaks making it nearly useless. The rat tail brush is nice though.