A refrigeration or climate-control system may include a housing, an evaporator, a drain pan, and a fan. The evaporator may be disposed within the housing and may include a coil positioned in a horizontal orientation. The drain pan may be disposed within the housing and may include an inclined lower wall disposed vertically beneath the coil. The lower wall may define an airflow path underneath the coil. The fan may force the air through the housing and airflow path.