There can be multiple reasons for this. If the vent line exhausts to the outside, it is possible that if the vent louvers are stuck open and rain may enter the line when windblown. More common is that dryer vent air is hot and moist due to the water being evaporated from the clothes. If the vent line runs through a cool/cold area, condensation may form in the vent line. If there are sags in the line, condensed water can accumulate in these places.
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