CDC 3E151 Volume 5 HVAC/R Fundamentals Practice Test

An air filter plays a crucial role in maintaining HVAC efficiency by preventing dust accumulation in the system. When an air filter effectively traps airborne particles such as dust, pollen, and other contaminants, it helps maintain clean airflow throughout the HVAC system. This is important for several reasons: clean air prevents the coils from becoming dirty, which can hinder the heat exchange process; it ensures that the system components operate efficiently without blockage; and it contributes to better air quality within the living space. By keeping the system clean, the air filter helps maintain optimal efficiency, prolongs system life, and reduces the likelihood of breakdowns, ultimately supporting effective climate control.

While some choices may suggest functions related to airflow regulation and energy consumption, none address the core purpose of the filter in maintaining system cleanliness and operational efficiency as directly as the chosen option.