The answer to 'why is my dryer vent filthy' is that a buildup of lint and debris in the dryer vent is a common problem that can occur over time. As your dryer operates, it pulls air through the vent to the outside, and this air carries lint and other small fibers with it. Over time, this lint can accumulate in the vent, restricting airflow and creating a fire hazard.
Some common symptoms of a dirty dryer vent include longer drying times, the dryer overheating, and increased energy bills. Regularly cleaning the dryer vent is important to maintain proper airflow, prevent fires, and ensure your dryer operates efficiently.