Crown aspirators are used to aspirate either hot or cold cracked beans and remove the hulls and other loose material from the cracks. They are built with the same heavy-duty feeder used for whole bean cleaning, and the units can either be choke fed or fed by regulated control. The special rectification section removes additional entrained meats from the hulls, reducing the load on the secondary dehulling system. Crown aspirators are fully insulated and designed for closed-loop air for warm applications. Depending on conditions, they can provide a significant amount of drying. Crown aspirators can also be used for once-through air.