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Cut it or just leave it.. it's not going to hurt anything.
Yes measure out the length you want take a razor knife and wire snips cut it where you want need to cut and it's Snoop The Wire leave a little piece of metal out bend it over on top of that way it keeps it from sliding off
All you need to do is just cut off some of that excess dryer vent hose. leave enough Room between the wall and dryer so you can get behind it.
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