Common sense (which could be wrong or against code) makes me deduce that the crimped end should be at the far end of a piece of pipe as it goes from dryer to vent. This way, the crimped edge is "going with" the flow of air/lint. Even if caught on the crimped edge temporarily, should eventually free up and blow out the vent.
If the crimped end were toward the dryer (anywhere along the run from dryer to vent), the crimped edge facing the flow of air current would allow lint to get stuck and gather on the crimped edges. Kinda like cholesterol in an artery, it would grow ever larger until blockage occurred.
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Chino 1960's to 1976, Torrance, CA 1976-1983, 87-91, 94-98 / Frederick Co., MD 1983-1987/ Valencia, CA 1991-1994/ Brea, CA 1998-2002/ Dana Point, CA 2002-2019/ Knoxville, TN 2019-Current/ FL 2022-Current
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