Airflow control in heating and air conditioning units

The present invention relates to the field of directing ventilating air and airflow control in a ventilating, heating or air conditioning system. More specifically, the present invention relates to a structure and method to provide air flow mixture via an air mixer structure (110) or 'baffle' located within a blend door (101). The simplified HVAC unit provides a baffle/blend (119) door assembly comprising an air mixer structure (110) wherein the attachment means of baffle and barrel door is such that it provides for ease of assembly. The baffle/barrel door assembly provides for smaller packaging volume with the same functionality as larger HVAC units.