Class B autoclaves are great space-savers built for high performance. They are microwave-sized autoclaves that fit easily on the counters of busy clinics and dental offices. Available in compact sizes of 19 and 29 liters, the Class B is the top-of-the-line of tabletop autoclaves. Essentially they are a miniature version of the larger EN 285 autoclave found in hospitals. The industry consensus about what the “B” in Class B stands for is “big,” not as a reference to size, but rather as a reference to performance. Class B tabletop autoclaves are expected to offer the same advanced performance as the much larger hospital sterilizers EN 285. The main advantage of Class B autoclaves is the use of a vacuum pump for both removing air and drying the load. Class B autoclaves can remove more than 99% of the air inside the chamber, ensuring no trapped air that would prevent steam from reaching the load surface, thus killing microbial life on the load.