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The whole box-like enclosure is heat insulated to prevent condensation at their surfaces. Many enclosures are sound insulated and are installed on vibration damping pads. Many others have damper vanes for controlling air flow.
The most common AHU's have their fans and motors enclosed inside box. Other specialized AHU's have motors outside box. There are some with steam coils too.
They can be made in numerous configurations too. Tall, short, wide, long, supply up, supply to side, and so on....
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