An agricultural air cart assembly is provided with individually controlled product distribution lines which allows for balanced pressure and even dispersal of air through different distribution lines of different lengths running to different sections or row units of a seeder or drill, Independently controllable, first and second product metering systems regulate the rates at which product flows from the storage compartment into the first and second distribution lines, respectively. Independently controllable, rotatable fans are operatively connected to corresponding first and second distribution lines and are configured to generate optimized air flows in the first and second distribution lines which entrain and carry the product downstream toward corresponding row units at balances pressures.
