Type C curtain dampers come in which of the following styles?

Type C curtain dampers are specifically designed for air management within HVAC systems and are characterized by their adaptability and effectiveness in controlling airflow. The correct choice includes oval, round, and square/rectangular styles, which are commonly used configurations for such dampers.

Oval dampers are often employed in applications where space is limited or where non-standard duct shapes require a more efficient design. Round dampers are typically favored for their simplicity in installation and effectiveness in maintaining a smooth airflow. Square and rectangular dampers are used in standard ductwork applications, making it easy to integrate these dampers into various systems without requiring extensive modifications.

These styles offer versatility in design and installation and enable effective control of airflow in different duct configurations, which is essential for maintaining optimal HVAC performance. The other options do not align with the common types of Type C curtain dampers found in standard HVAC practices.