- VALUABLE TOOL : Comes with nine (9) flexible rods. Our dryer vent cleaning brush is 4" diameter, and can be used in 3-4" ducts. These can also be used with a/c ducts and pellet stove pipes. They work great with PVC, flex ducts, metal ducts, pipes, and delivers results fast.Note:Please don’t use it for flexible foil duct work.
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