Introducing the Ai 14-shelf capacity 5 sided wall-heating 5.0 cu ft vacuum ovens, come standard with secondary over-temp protection dial, stainless steel tubing, stainless steel vacuum & vent valve, oil-filled vacuum gauge, and two year warranty. SST (stainless steel) tubing refers to internal tubing and compression. external tubing not included. Oven comes standard with 7 shelves.Best choice for the curing and converting of oil extracts. With deep vacuum level, they can operate at temperatures which allow the degassing/purging process to occur rapidly, thus increase productivity and allow for the production of superior quality products with minimal processing time