Flour is stored in two 70,000 lb (31,752 kg) silos equipped with rotary airlocks feeding a pneumatic conveying system that delivers material to the sifter. The flour enters a vertical inlet at the feed end of the centrifugal sifter, a horizontal, cylindrical machine that houses a 30 mesh (516 micron) stainless steel cylindrical screen mounted on a central shaft that is fitted with helical paddles. A 3 hp (2.2 kw) motor rotates the paddles, which accelerate the speed at which on-size flour passes through apertures in the screen and drops into the pneumatic line below. Oversize debris is ejected through the back end of the cylinder into a sealed quick-release receptacle. Each sifter processes about 34 kg/min (75 lb/min) of flour.