What type of cover must a dryer vent have?

A dryer vent must have an exterior cover to prevent outside elements from entering the vent system while still allowing exhaust air to escape from the dryer. This design helps to deter pests, such as birds and insects, from entering the vent, which could restrict airflow and potentially create a fire hazard.

An exterior cover also assists in weatherproofing, ensuring that rain, snow, and debris do not obstruct the venting system, thereby maintaining optimal dryer performance.

While aluminum and plastic materials could potentially be used for the vent covering, what is most important is that the cover is positioned externally. Using an appropriate exterior cover helps to enhance safety and efficiency in the dryer venting system.