What are the two types of filter options mentioned?

The correct answer focuses on the types of filter options characterized by their management of airflow and media utilized in filtration systems. Bypass methods in air filtration involve how air flows around or through a filter, affecting system efficiency. Partial bypass allows some air to bypass the filter, which can be useful in balancing airflow in certain systems or when higher airflow is necessary. Total retention refers to filters designed to capture all particles passing through, ensuring maximum air quality and reducing contaminants.

Understanding the terminology helps in identifying how various filters operate within HVAC systems and their efficiency in trapping contaminants. In this context, knowing the distinction between bypass and retention is crucial for scholars and practitioners in selecting appropriate air filtration methods for different applications.