high strength conduit duct rod reel duct rodder
Rod Selection
When being pushed through the duct, any rod will tend to form “sine waves”, hitting the wall of the duct at certain intervals.
Each time the rod comes in contact with the wall of the duct, it causes friction. The friction will build and eventually prevent the rod from being pushed any further. Small rod in large duct will make more frequent contact with the ducting; the same rod in smaller duct will make less frequent contact and therefore less friction so it can be pushed further. Large rod in small ducting is a good situation, but reduced flexibility of the rod may cause increased friction in the tighter bends
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