Florida Home Inspector Practice Test

What effect does a dirty air filter have on air circulation?

1. Improves circulation

2. Has no effect

3. Reduces air flow

4. Increases humidity

The correct answer is: Reduces air flow

A dirty air filter primarily reduces air flow within a heating, ventilation, and air conditioning (HVAC) system. When the air filter is clogged with dust, dirt, and other particles, it obstructs the normal passage of air through the system. This restriction not only hinders the efficient circulation of air but can also lead to additional strain on the HVAC system, potentially resulting in decreased efficiency and increased energy consumption. In a well-functioning system, a clean air filter allows for optimal air flow, which contributes to better indoor air quality and temperature regulation. When the air filter becomes dirty, the ability of the system to circulate air effectively is compromised, causing uneven temperatures in the home and potentially causing the system to work harder to maintain desired comfort levels. While it may seem that a clean filter would allow for improved air circulation, a dirty filter has the opposite effect, illustrating the importance of regular filter maintenance in home HVAC systems.