Haze or Fog machine for outside night scene.

[Alexander Sutton Hough]

I am trying to figure out how strong of a haze machine I would need to fill the background of a scene. Will be in a 85ftx85ft space facing a three story warehouse, to camera right is a long one story wall, behind and to camera left wide open parking lot.

If the wind is minimal that night what size haze machine would work in this space at night? I will be backlighting the scene with lights coming from the three story warehouse's roof. Or would a Fog machine work better?  

I am used to doing haze with a small hazer indoors.