Air purifiers; Apparatus and instruments for use in the purification, separation and sterilization of liquids and gases used in the biotechnology, pharmaceutical, medical, biopharmaceutical and food and beverage industries; Electro-chemical flue gas scrubbing machines; Filters and filtering devices for air and gas conditioning; Fluid separation apparatus for separation of gas from liquid in a chemical or oil refinery; Gas purification machines; Gas recycling system comprised primarily of one or more of the following pieces of equipment, namely, pressure swing adsorption equipment, temperature swing adsorption equipment, perm selective membrane equipment, solvent extraction equipment, pervaporation equipment or solid adsorption equipment, for the recovery, purification and return of gases in industrial applications; Hydrogen-generation equipment and components, namely, hydrogen generators, hydrogen purifiers, hydrogen purification membranes, fuel processors, and steam reformers; Sterilization units for buildings in the nature of apparatus that floods a room or space with anti-bacterial gas that eliminates all bacteria in the room or space