Through the following contents, you can learn more about Fan Filter (Filter Unit, Filter Fan):
Model: FB9803, FB9804, FB9805, FB9806, ZL803, ZL804, ZL805, ZL806
Size: 148x148mm, 204x204mm, 256x256mm, 320x320mm

FB9803 Fan Filter(filter unit, filter fan) is used for dust proof of fan