The Dedicated Outdoor Air System Air loop (or DOAS loop) is a central air system that delivers outdoor air to one or more child air loop systems. The amount of delivered outdoor air is based on the sum of the outdoor air flow demand from the air loop systems that it serves.
The central DOAS system can pre-treat outdoor air with given precool and preheat air conditions before distributing it to the downstream air loops.
The image above shows a DOAS loop connected to a downstream VAV Air loop.
See also: