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period two
Components of a VAV System
notes
Diffusers
flexible
duct
diffuser
sheet metal
supply duct
primary air
VAV
terminal unit
Figure 48
Diffusers
Each VAV terminal unit is commonly connected to a downstream, sheet-metal
duct that is then connected to the remotely-located diffusers by flexible ducts.
Diffusers distribute the supply air effectively to the conditioned space.
Proper air diffusion is an important comfort consideration, especially in VAV
systems. Because VAV systems require the diffuser to provide proper space air
mixing over a wide range of airflows, diffusers that are specifically intended for
use in VAV applications should be used to prevent cold air “dumping” at low
airflow rates.
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