An air seeder venting system comprising a filter screen mounted in a distribution head of an air seeder for separating seeds from air fed from a supply conduit, the distribution head having an inlet in communication with the supply conduit, a plurality of seed outlets in communication with seeding lines, and an air exhaust, wherein the filter screen is located so as to have at an upstream side the inlet and the plurality of seed outlets, and at a downstream side the air exhaust.