Dirt and crumbs may be more noticeable to the eye, but some of the best vacuums can clean ... a HEPA filter located on the exhaust, where the air blows out of the vacuum and back into the room.

There are different types of air purifiers, but experts recommend models that use HEPA ... room, the air smelled clean and crisp, and we found a noticeable amount of pet hair built up on the filter.