Keho's farm and agriculture equipment includes grain aeration systems, grain air blowers, grain handling equipment, crop lifters, batch grain dryers, grain drying fans, grain bin accessories, grain bin floors and grain bin roof vents.After 20 years of serving farmers KEHO classifies air drying into three types: Aeration, Natural Air Drying and Pressure Curing. All three applications require some type of perforated duct system. The main difference between them is the airflow supplied to the stored croP.