What are screens used to protect air intake and exhaust openings called?

The term "Air Intake and Exhaust Screens" refers specifically to the devices that are designed to protect the openings through which air is drawn into or expelled from a mechanical system, such as HVAC units or combustion systems. These screens serve several important purposes. They prevent the entry of debris, leaves, and pests that could obstruct airflow and negatively impact the efficiency and safety of the system. Additionally, they help maintain the cleanliness of the air intake and exhaust areas, which is crucial for optimal operation and longevity of the mechanical equipment.

While other options may refer to related components in mechanical systems, they do not specifically denote the protective screens for air intakes and exhausts. For example, "Flue" refers to a duct for conveying exhaust gases from a fireplace, stove, or boiler, and "Combustion Air Openings" generally refers to the designated spaces that provide air for combustion but not necessarily a protective component. "Shield Plates" may serve protective purposes but do not specifically pertain to air intake or exhaust openings. Therefore, "Air Intake and Exhaust Screens" is the terminology that accurately identifies these protective devices.