How to check the airflow of Dell Switches?

Pay attention to the specific description of the device.

For example, "N2248X-ON PS/IO airflow with OS6: 48x RJ45 10M/100M/1G/2.5G auto-sensing ports, 4x SFP28 ports, 2x 40G QSFP+ ports, 1x 550W PSU included" shows that the PS/IO is venting from the power side toward the port, and vice versa, IO/PS is venting from the port side toward the power supply.