The cooling systems in S5850-48S6Q, S5850-48S2Q4C and S8050-20Q4C switches, each consists of four fan modules and a single fan in each power supply and provide 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 S5850-48S6Q, S5850-48S2Q4C and S8050-20Q4C switches are hot-insertable and hot-removable field-replaceable units, you can remove and replace the module without interrupting normal switch operation.
