Climate Control System - Description & Operation: Notes
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The purpose of the air distribution system is to route air to the designated registers. This is accomplished when air enters the plenum and is directed to the desired ducts by the use of air distribution doors.
The air distribution system contains the heater core and evaporator core, blower motor and distribution doors. All of the air is mixed and distributed from the plenum assembly depending on the distribution door positions.
Refer to Air Distribution and Filtering article.