The Fitzpatrick Comminutor F8B Fitzmill is equivalent in size to the FAS08 and has 1.8 times the capacity of the model D size FitzMill.

The "B" Series Fitzmill is designed with a fixed chamber which is attached to the mill base. Access to the screen and rotor is conveniently accomplished by opening a door. Though the mill chamber remains fastened to the base during cleaning, the internal components such as the mill screen and rotor are removable. The mono-block chamber design, featuring smooth internal surfaces and a large chamber door opening, allows the B Series mill housing to be sanitized easily.