Read the Material Safety Data Sheets for materials being used in a hood. Note the physical, chemical, and toxicological properties of materials being used before hand. Turn on the light for proper illumination. Keep the hood clear of clutter and unused materials. Do not use a hood for long term storage.
Storage reduces air flow and compromises hood capture efficiency.
All work should be done at least six inches from the front of the hood. When large equipment is used, place on blocks to allow for a two inch air flow gap under the equipment. Always lower the sash when not working in the hood. Never place your head in the hood while an experiment is on going. Avoid quick movements while working or passing in front of the hood.