What factor can negatively impact an AFD's CFM rate?

Extending ducting can negatively impact an air filtration device's (AFD) CFM (cubic feet per minute) rate because it can introduce additional resistance to airflow. When ducting is extended, especially if it includes bends, turns, or diminishes in diameter, the overall path that air must travel becomes longer and more obstructed. This can lead to a decrease in the effectiveness of the AFD in moving air, resulting in a lower CFM rate. Additionally, the increased surface area of the ducting can lead to more friction loss, further reducing airflow efficiency.

In contrast, adding more filters generally increases the ability to capture particulates, though it can also lead to increased resistance if the filters are not appropriately matched to the system. Increasing airflow typically suggests enhancing the CFM rate rather than hindering it, and reducing humidity can improve air quality and can facilitate better airflow by reducing the weight and stickiness of particulates in the air.