A metering assembly is provided for use with an air seeding system for delivering one or more particulate materials to an air seeding apparatus, the air seeding system comprising a product tank, configured to hold a particulate material and having an outlet, the metering assembly comprising at least one metering device, the metering device having a housing, an inlet positioned in the housing to receive particulate material from the outlet of the product tank, a first loading zone and a second loading zone, and a flow controller provided beneath the inlet and operative to route particulate material that has entered the metering device through the inlet in a first direction towards the first loading zone and in a second direction towards the second loading zone.