air purifiers, air purifiers for household purposes; industrial and commercial air purifiers; air purifying units for commercial, domestic, and industrial use; air purifying units comprising an ionization apparatus; air purifying units comprising an ionization apparatus and an ultraviolet light; air purifying units comprising an ionization apparatus and filter; air purifying units comprising an ionization apparatus, filter, and ultraviolet light; air purifiers not for HVAC systems; ionization...