Abstract: A grain column dryer and conditioner includes two-spaced air pervious walls that form a generally vertical column of grain to be heated and dried. A plenum chamber is formed between the innermost of the pervious walls and is divided into upper and lower air flow sections by a plenum divider mounted within the innermost of the walls. A blower and burner assembly having an inlet and outlet is mounted within the plenum chamber to force heated air into the upper heated section and out through the column of grain adjacent the upper section while simultaneously pulling cooler air into the lower section of the plenum chamber through the grain column adjacent the lower section.