These Blueair Blue Pure 411 Air Purifiers contain fabric free filters and are Energy Star rated, which are things people looking for the best air purifier want. And for those looking for the best air purifier with washable filter, having a true HEPA filter filtration system that covers a decent amount of square feet is as important. Why We Like It - Blueair Blue Pure 411 Air Purifier These Blueair Blue Pure 411 Air Purifiers use a true HEPA washable pre filter to capture viruses, allergens, smoke, odors, mold, dust, germs, and pet dander in most rooms in your house or office. Power/Speed This Blueair quality one button touch device, available at Amazon services LLC, gives you three different air speeds and an impressively low noise level. With these three speeds, the activated carbon filter uses a three stage filtration process, much like with the Winix Plasmawave 5500. Efficiency The particle filter of this air purifier can cover a room size up to 175 sq ft. In fact, with rooms the correct size, this device can handle several air changes per hour to capture 99% of allergens, CADR smoke, dust mites and spores, like with the Hamilton Beach 04386A Air Purifier. Versatility Like with the Hamilton Beach Truair, the main purpose for this Blueair Pure 411 Air Purifier is to use the washable pre filter to capture viruses, allergens, smoke, odors, mold, dust, germs, and pet dander in most rooms in your house or office. Durability At 3.4 pounds, this device is pretty light and might get knocked around. But it does hold up strong and can simply be moved to different spaces when needed. The outer casing and filter holder seems durable enough. Value At the price it’s being offered, you’re getting a pretty decent air purifier for smaller to medium sized rooms. It also comes with the option for a three or four year protection plan and free shipping and returns. Blueair Blue Pure 411 Air Purifier Wrap Up These Blueair Blue Pure 411 Air Purifiers contain fabric free filters and are Energy Star rated, which are things people looking for the best air purifier want. With these three speeds, the activated carbon filter uses a three stage filtration process. Capture viruses, allergens, smoke, odors, mold, dust, germs, and pet dander in most rooms in your house or office.