I see other vacuums such as Eureka, Hoover and others, claiming to have HEPA filtration. What is the difference?
The difference is quite significant. All vacuums blow out the same amount of air as they vacuum in. It is absolutely crucial that the vacuum be sealed so the the only air blowing out of the vacuum, first passes through the HEPA filter. Other brands leak from 15% – 35% of the exhaust air (and allergens) before it ever reaches the filter.