After a decade of development and tens of millions of dollars, the silent night is the only high cadr (standard comparison for air purifier effectiveness - clean air delivery no moving parts (fan), no filters, half the power of energy star, passes ul867 ozone requirement, removes 100% of micron particulate and even 99% of 20 nanomicron bacteria and virus particles - swine flu, sars, bird flu, even this is the ultimate air cleaning technology for the 21st
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