HEPA Vacuum Cleaners – These vacuums filter at least 99.95% of particles 0.3 microns in size. For those with allergies to dust, pet dander, pollen, mold spores, dust mites, smoke and other common allergens in the home. They are also recommended to people who want to improve the over all indoor air quality. HEPA vacuum cleaners partnered with HEPA air purifiers help keep the home air clean. While bagless vacuums can be hepa certified you must dump the dust outside of the home to keep it from coming back into the home. Using a bagged vacuum is much more efficient in keeping dust out of the home, when you throw your vacuum bag away all the dust goes with it. With bagless HEPA Vacuums you must replace the filter every three to six months where bagged HEPA vacuums are recommended every 12 to 18 months.