The Nu Flow Air manifold or “Main Header” is the first gate that air traveling from the compressor encounters. The Manifold distributes air from hoses attached to each side of the unit. One side is designated hot and the other cold. Each of the trunk lines that lead off the Main Air Manifold connect to a Compact Manifold in the rooms where pipe access is available (Kitchen, bathrooms, laundry room, etc.). The air flow from the compressor is controlled with the valves on the Main Manifold and then fine tuned as required on the smaller units.