Commercial 4.5 gram / second and better
3. Ventilation passive or active to take the motor heat out of the encasement, there is enough heat caused in the friction of the espresso coffee beans in between of the burrs to take care of. Necessary rather at 1500 rpm than 500 rpm or 420 rpm.
4. Quality and durability of course.We intentionally limit our grinders to a max price of $ 2,000. We don't see any real advantage of more expensive grinders for the daily heavy load. Please call us to help you to find the right size and whether doser or on demand is the better match for you: 800 746 6174