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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The two belts are then stretched against each other along their path, and water is squeezed through weave of polyester belt material. The semi-solid sludge still sticking to belts is then scrapped off when belts pass through plastic knife-edges held against them.

The semi-solid sludge that is scrapped off is collected at a hopper and conveyor system where they can be collected in bags or further dried.

Simple isn't it? Not really! The two belts must travel at same speed and there must be some way to ensure that belts do not drift away from their intended path....

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