Personally, I straight cut grain at 18 -19 % , sometimes the combine monitor went into the 20’s %, which seemed crazy at the time, but the forecast was for 8″ of wet snow. Anyway, I finished the standing grain 10 hours before the snow, and spent the next week babysitting this dryer and my very damp grain. For the farmers in our area they know what happened to all that standing wheat , and durum, after the snow it was flat as a pancake, bleached and downgraded. The grain I warmed / dried with this heater was in the bin, top 2 grades, and dry. Over those 2 -3 weeks of drying, I was anxious to see how the grain would pan out, in the end I was very tired, but also tickled pink.