Once the weather turns cold and the heat kicks on, your home starts to get dry and static electricity arrives once again. This minor nuisance that causes siblings to shock each other for fun can actually be dangerous if it ignites lint that has built up in or around your dryer.
If your dryer exhaust hose tube is longer than 10′ this may be a bit more difficult. And if it is longer than 10′, did you know that your dryer may be working extra hard to dry your clothes? Worse yet is if you have a long tube that goes up into the attic (or the eaves) and then out the roof. The warm moist air from the dryer enters the cold attic, and condensation forms in the exhaust tube. Do you know where this little story is going? Well, at first your dryer can’t dry as quickly because the tube is blocked by water. Eventually it will fill with enough water to cause the exhaust tube to split and guess where all that water goes? Through your ceiling, that is where!
Source: Time To Clean Your Vents