I have a few 1000# ASF stand and fill here are some tips, keep it as level as possible the rake at the bottom is not enough in my opinion if unlevel the low side won't fun down to the funnel on it's own. Don't use dirty, powdery corn they do condensate and will clog up and to that point put some weather stripping on the corners to allow some more air movement. I think there control boxes are the best on the market