Index: firmware/App/Drivers/GLXferPump.h
===================================================================
diff -u -ra25d5c24569e3d77487a75498a4e10dd83ada9c4 -r3074682de43568567f244e2663d1f75b7e6ea85e
--- firmware/App/Drivers/GLXferPump.h	(.../GLXferPump.h)	(revision a25d5c24569e3d77487a75498a4e10dd83ada9c4)
+++ firmware/App/Drivers/GLXferPump.h	(.../GLXferPump.h)	(revision 3074682de43568567f244e2663d1f75b7e6ea85e)
@@ -34,6 +34,8 @@
 // ********** public definitions **********
 
 #define AIR_PUMP_MOTOR_OFF            0.0F            ///< Power level setting (PWM) for H12 air pump to turn pump off.
+#define AIR_PUMP_DUTY_CYCLE_MIN       0.0F            ///< Air pump minimum duty cycle in percentage
+#define AIR_PUMP_DUTY_CYCLE_MAX       100.0F          ///< Air pump maximum duty cycle in percentage
 
 // ********** public function prototypes **********