If your vent is less
than 3 feet long to the outside duct, the brush can be pushed into the
duct to maintain it. (Foil vent is not serviceable)

For longer
vents, or vents which run vertically, the best approach is to insert the
handle end first into the duct to the other end, then pull the head
through, along with the lint. For extremely long vents, simply insert an
electrician's fish tape thru the run and attach it to the brush handle
to do your job with ease, or get the new Rotary
Vent Cleaner tool.
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Dryer Vent Cleaning Equipment