Abstract: In this pneumatic feeding system fibers are conveyed by air to surge sections formed in the upper ends of vertical branch ducts. Two sets of feed rolls are mounted in the midsection of each duct beneath the lower end of its surge section to feed fibers downwardly onto a kicker roll, which opens the fibers and directs them downwardly through a tapered duct section and onto a rotating screen condenser which is mounted in the lower end of each vertical duct. The fibers are withdrawn in a uniform layer from each screen by a doffer roll, and are fed to the feed assembly of a web forming machine. In one embodiment the density of the fibers in the surge section of a duct is controlled by selectively admitting atmospheric air to the duct adjacent its midsection, while in another embodiment this control is effected by adjusting the rate of flow of air in a closed air flow system.