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.
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