Abstract: A grain dryer has pair of heating columns in communication with an upper plenum, and a pair of cooling columns in communication with a lower plenum. A heater is located between the lower plenum and the upper plenum, wherein air is heated by the heater as air in the lower plenum is pulled through the heater and into the upper plenum. As the grain flows into the cooling column, it is exposed to cooling air being pulled through the cooling column into the lower plenum. A cooling air bypass system having a plurality of bypass tubes brings bypass air into the lower plenum from outside the grain dryer without having the bypass air come into contact with the grain being cooled in the cooling section. The cooling air bypass system includes a grill with an adjustable damper to adjust the amount of bypass air that flows into the lower plenum.

Abstract: A grain dryer has pair of heating columns in communication with an upper plenum, and a pair of cooling columns in communication with a lower plenum. A heater is located between the lower plenum and the upper plenum, wherein air is heated by the heater as air in the lower plenum is pulled through the heater and into the upper plenum. As the grain flows into the cooling column, it is exposed to cooling air being pulled through the cooling column into the lower plenum. Ductwork adjacent each heating column includes vertical sections arranged along a length of the grain dryer. Each vertical section has a fan located adjacent the uppermost horizontal level of the heating column. Each fan takes a suction from the ductwork to draw heated air from the upper plenum through the heating column.

Abstract: An agricultural dryer assembly has a fan apparatus and burner assembly that form a longitudinal dryer axis. An airflow transition mechanism is positioned between the fan apparatus and the burner assembly and has an endcap with an end plate that is substantially perpendicular to the dryer axis. A transition housing has an upstream end proximate the fan apparatus having a first diameter and a downstream end proximate the burner assembly having a second size, and an open middle. The airflow transition mechanism also includes an end plate perpendicular to the airflow and for a single burner configuration, a first and second air-directing crossing members and for a dual burner configuration, two inlet devices positioned in a middle opening of the transition housing that extend through the axis of the fan heater assembly.

Abstract: An agricultural dryer assembly has a fan apparatus and burner assembly that form a longitudinal dryer axis. An airflow transition mechanism is positioned between the fan apparatus and the burner assembly and has an endcap with an end plate that is substantially perpendicular to the dryer axis. A transition housing has an upstream end proximate the fan apparatus having a first diameter and a downstream end proximate the burner assembly having a second size, and an open middle. The airflow transition mechanism also includes an end plate perpendicular to the airflow and for a single burner configuration, a first and second air-directing crossing members and for a dual burner configuration, two inlet devices positioned in a middle opening of the transition housing that extend through the axis of the fan heater assembly.