Very well designed, great warrenty, very quiet on lower settings.
A little pricey both to purchase and maintain
The Defender is an excellent product from what I've seen. HEPA cleans down to .3 microns, Defender down to .1. It's also FDA certified as a Class 2 medical device.
The claims are that you need 1 for each level of your house, but they're only rated to clean 17,000 ft^3. If you do the math,...
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