The MinusA2 Ultra Quiet HEPA Air Purifier is THE BEST HEPA we have ever owned. We have owned over 20 different filters over the years (still own HEPA's from Honeywell, Whirlpool Whisper Quiet, 3M, Blueair and others) from HEPA's to the ionizing towers (different brands, all did not clean the air that well and make us choke from ozone, so got rid of them in favor of True HEPA filters). One thing we were always looking for was a filter that worked and was quiet (never found one, the Whirlpool Whisper Pure was the best so far, but still noisy).
Well, after doing a lot of research online, I stumbled on the Rabbit Air filters. Looked like great technology, so we decided to order one and try it (Home Depot had the best price, plus a free shipping offer so what could we loose). The filter arrived and it is very compact. Unpacking all the filters, you can see that each layer is of very high quality (it's the Only filter that has all these cleaning layers, toxin filters, and bactericidal properties). We put all the filters in place and then the final test - fire it up.
WOW, it is VERY QUIET when on sleep/low mode - you can barely hear it. And on the highest it is still quieter than our other filters on low. It cleans extremely well, filters out smells, and keeps the air very fresh and pollen free. We all have severe seasonal allergies and do our best to keep our house pollen free. This is the best so far at doing this.
I can recommend this filter without any reservations!!! Bottom line: very well built, great technology, true HEPA filtering, kills bacteria, filters out smells and is the QUIETEST filter on the planet with a true HEPA filtering ability.