S4100–ON Series S4128F-ON, S4148F-ON, and S4148FE Installation Guide November 2017

Fan combinations

Fan installation is done as part of the factory install based on SKU type. The S4100–ON Series has stock keeping units (SKUs) that support the following configurations:

• AC PSU with fan airflow from the I/O to the PSU—normal
• AC PSU with fan airflow from the PSU to the I/O—reverse
• DC fan unit with airflow from the I/O to the PSU—normal
• DC fan unit with airflow from the PSU to the I/O—reverse

Be sure to order the fans suitable to support your site’s ventilation. Use a single type of airflow fan in your switch. Do not mix reverse and normal airflows in a single switch.

For proper ventilation, position the S4100–ON Series switch in an equipment rack or cabinet with a minimum of 5 inches (12.7 cm) of clearance around the exhaust vents. The fan speed varies based on internal temperature monitoring. The switch never intentionally turns off the fans.

For more information, see Fans.