What issue arises from installing a screen at the termination hood of a dryer duct?

Installing a screen at the termination hood of a dryer duct can lead to serious issues, especially concerning airflow and lint buildup. The primary concern is that the screen can trap lint that is carried along with the exhaust air from the dryer. As lint accumulates on the screen, it can create a blockage at the termination point of the duct, reducing airflow. When airflow is obstructed, it can lead to inefficient drying, increased drying times, and can heighten the risk of fire hazards due to lint buildup in the duct system.

Moreover, the design of dryer ducts requires unobstructed airflow to efficiently expel moisture and lint from the dryer to the outside. If the screen creates a barrier, it not only reduces the exhaust capability but also may lead to moisture retention within the dryer, contributing to performance issues and appliance damage. Thus, while it might seem that a screen could add some level of protection or enhanced safety, in practice, it compromises the efficiency and safety of the dryer operation due to the potential for lint accumulation and airflow obstruction.