What restrictions are placed on dryer vent screens?

The restriction regarding dryer vent screens emphasizes that they are not allowed to be installed at the termination of a dryer vent. This requirement is crucial for ensuring safety and efficiency in dryer operation. When dryer vents are terminated with screens or covers, it can impede airflow, leading to increased drying times, a potential buildup of lint, and, ultimately, a higher risk of fire hazards.

In dryer vent systems, unobstructed airflow is critical for preventing overheating and ensuring that moisture is effectively expelled from the dryer. Without proper termination, exhaust gases can become trapped, contributing to lint accumulation and increasing the likelihood of flammable materials igniting. Therefore, the prohibition of vents terminating with screens serves to maintain safe operational conditions and energy efficiency.

The other options address considerations related to materials (like metal), maintenance (such as regular cleaning), and accessibility (easily removable), but they do not focus on the essential reason for prohibiting the use of screens at the termination of dryer vents.