air purifying unit for industrial use and attachments for use therewith, namely, nozzles, hoses, articulated arms and air intake endpieces sold therewith; air purifying units for hand-held soldering irons, soldering work stations, production soldering equipment, welding stations and equipment, laboratory work stations, medical procedure areas and fume and/or airborne particulate-producing work stations; temperature controlled convective or conductive heating units for heating electronic components or assemblies; programmable heating unit for heating electronic components and assemblies for use in the diagnosis, testing, modification, repair and production of electronic assemblies; electrically operated pulse heat soldering and desoldering tools, namely, conductance and resistance type tweezer heating tools