Abstract: Air assisted harvesting means having a manifold extending transversely across the cutter bar platform of a harvester with a plurality of tubes depending therefrom, and nozzles on the tubes arranged to discharge air streams some of which at least partly overlie the air streams of others, so as to provide a deep rearwardly moving air curtain.

Abstract: An improved pressure air manifold and outlets system for grain header or harvester cutting platforms comprising a manifold which extends across and above the cutting platform, the manifold being adjustable for height position and angularity and being provided with a plurality of relatively narrow shaped outlet tubes which depend from the manifold and which terminate nominally above the cutter bar of the cutting platform, each outlet tube being directed to discharge pressure air substantially in a rearward direction also some air in a lateral direction to form a continuous curtain of air and a blower to impart an air flow through the manifold to discharge through the outlet tubes.