AHU with Return Air System

An air handling unit (AHU) takes outside air, filters it, and pushes it through a building through ductwork. This AHU has a separate duct system that pulls dirty air out from the rooms back to the AHU, where a fan will discharge it to the exterior or recycle a portion through the unit.
An air handling unit (AHU) takes outside air, filters it, and pushes it through a building through ductwork. This AHU has a separate duct system that pulls dirty air out from the rooms back to the AHU, where a fan will discharge it to the exterior or recycle a portion through the unit.

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