Product review (1 stars): Total waste of money. Get a leaf blower.
I can only give this one star as opposed to zero, which is very unfortunate. This is a total waste of money. The supposedly "self-feeding" augur brush does nothing of the sort. The "flexible rods" will only be tangled when trying to push the "self-feeding" augur brush through the vents, causing them to flail all over your work space. Use a leaf blower instead.