try this tweak...
; >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
EntityPicked = LinePick (EntityX#(Player), EntityY#(Player), EntityZ#(Player), 0,-3-Rnd(1),0)
If EntityPicked = Fan Then
y_vel#=y_vel#+0.025
End If
; >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
; >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
EntityPicked = LinePick (EntityX#(Player), EntityY#(Player), EntityZ#(Player), 0,-3-Rnd(1),0)
If EntityPicked = Fan Then
y_vel#=y_vel#+0.025
End If
; >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>