The cooling system in S5850-32S2Q switch consists of four fan modules and a single fan in each power supply and provides front-to-back (air exhausts through the back of the switch) airflow depending on the fan modules and power supplies installed in the switch.
Fan modules for S5850-32S2Q switch are hot-insertable and hot-removable field-replaceable units, you can remove and replace the module without interrupting normal switch operation.