The Enterprise Chassis supports up to a total of ten hot-swap fan modules: two 40 mm fan modules and eight 80 mm fan modules.

The two 40 mm fan modules distribute airflow to the I/O modules and chassis management modules. Both of these fan modules ship with the chassis. The 80 mm fan modules distribute airflow to the compute nodes through the chassis from front to rear. Each 80 mm fan module actually contains two 80 mm fan modules, back to back at each end of the module, which are counter-rotating. The following figure shows the 80 mm fan module.

Four 80 mm fan modules are installed standard in chassis model 8721-A1x and CTO orders. The maximum number of 80 mm fan modules that can be installed is eight.

Specification

Product
Product id	483847
Brand	Lenovo
Partnr	43W9078
EAN/UPC code	883436173872
Performance
Suitable for	Computer case
Type	Fan
Fan diameter	80 mm
Supported processor sockets	N
Compatible processor series	N
Design
Product colour	Black, Silver
Number of fans	2 ventilator(en)
Technical details
Compatibility	IBM Flex System Enterprise Chassis