Most likely being you don’t see on outside wall low it vent out top of the roof? Look on you’re roof for vent turned down so rain won’t get blown in above the wall that you dryer against. Yes they are known to have plugging problems due gravity having to force air up ANd out the roof. IMO should be cleaned out about every 3 years depending on how much you wash. Mine real easy, vent out the garage wall behind the dryer low to ground and the vent tube only about foot long going through the wall.
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