ADVA Optical Networking F7/FAN-FILTER/7HU/9HU. Part Number: 0013700002- Fan Air Cleansing Filter Set (10 Pcs) for FSP 3000R7 (SH7HU and SH9HU) and FSP 150EG (CH-10U) 10 air filters. it is recommended to exchange the air filters after 6 month – latest after 12 month