Fixed Ducted Constant Zone

This is a relatively old fashioned way of achieving constant airflow across the coil

It requires the system to be designed with one zone that has no zone damper fitted to it

This is normally the main living area in the home or a common area in an office building

 The downside with this configuration is that air will always be delivered to this area regardless of whether it is occupied or not

This reduces the diversity of the system and may necessitate a larger AC unit to be installed, thereby increasing both the capital and running costs of the system

 In addition the noise to this constant zone may increase when all other zones are closed

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