Which of the following actions would not interfere with the airflow patterns at the front opening of a biosafety cabinet?

Positioning equipment close to the rear of the cabinet is a practice that helps maintain proper airflow patterns within a biosafety cabinet. When equipment is placed near the back, it does not disrupt the flow of air that is drawn in through the front opening. This allows for the uninterrupted passage of air, which is essential for ensuring a sterile environment while the cabinet is in use.

In contrast, other actions such as adjusting heater settings, discarding waste systematically while working, or making frequent arm movements can disrupt the airflow. These actions may create turbulence or change the airflow dynamics, potentially compromising the safety and effectiveness of the biosafety cabinet in protecting both the user and the samples being handled.