A cotton air harvester header assembly for attachment to the front lifting mechanism of a conventional self propelled cotton harvester's chassis, for movement through a field of cotton plants in equally spaced rows. Air harvesters use air flow (wind, vacuum, atmospheric pressure) to harvest cotton. The enormous amount of plant material moving thru harvester's row units, create a self cleaning environment using cotton plants as a cleaning method to continually push unwanted material past harvester's self cleaning extractor units. Air harvesters do not require spindles, doffers, brushes, rotating drums or cutter blades, and the elimination of thousands of parts, allows harvester's row units to be grouped closer together than spindle or stripper harvesters, resulting in a more versatile cotton harvester which can be configured to harvest wide row or narrow row cotton, and be mounted on a tractor or used as a single walk behind air harvester row unit.