diff --git a/sonic_platform_base/fan_base.py b/sonic_platform_base/fan_base.py
index 7ce8c5f750a2..9662f120e053 100644
--- a/sonic_platform_base/fan_base.py
+++ b/sonic_platform_base/fan_base.py
@@ -18,6 +18,7 @@ class FanBase(device_base.DeviceBase):
     # Possible fan directions (relative to port-side of device)
     FAN_DIRECTION_INTAKE = "intake"
     FAN_DIRECTION_EXHAUST = "exhaust"
+    FAN_DIRECTION_NOT_APPLICABLE = "N/A"
 
     # Possible fan status LED colors
     STATUS_LED_COLOR_GREEN = "green"