... and horns ventilation box, outside the box filled with grain horns, grain, hot air flow of top-down by air ventilation quarter, down ... horns layer interlaced ventilation boxOutside the box filled with grain horns, grain, hot air flow of top-down by air horns, and direction ... through box, the exhaust gas grain horns box. Hot air and grain flow both positive and reverse flow, called the mixed flowHot air ...