Abstract: A portable hull separator includes a closed housing defining a pair of apertures which support removable drawers together with a plurality of air apertures. An air flow chamber within the housing is subjected to an air flow created by a motor driven fan. A seed bin within the housing is coupled to a descending air passage such that seed and hull material within the bin is caused to flow downwardly through the passage in which it is subjected to a transverse air flow. Adjustable gates are provided which alter the air flow characteristics and thereby the hull separation characteristics of the separator in accordance with an external adjustment.