all of the vacuums have hepa filtration, but only the shark has a system that's completely sealed.ook what we found. as the first vacuum sucked up fine dust, our black-light revealer showed the dust escaping into the air before it even reached the hepa filter. when we tested the second vacuum, we found the same disturbing result. but when we tested the shark rotator lift-away, not a speck of dust escaped. that's because shark's anti-allergen complete seal technology keeps 99.99% of all dust, dander, and allergens locked inside, proving shark keeps the air your family breathes cleaner with a system that's completely sealed. >> a leaky vacuum can create significant problems for the average family. having an excellent vacuum, such as one with powerful suction, hepa filtration, and a completely sealed unit absolutely contributes to a healthier indoor environment for one's family. >> so, the fact that i can keep all of the pollen and the dust and the allergens in this canister -- it's just a real benefit. and i just feel better knowing that my air is cleaner, my carpet is cleaner. it's