* Tested to IEC 60312-1 Cl. 5.1, 5.2. An average of hard floor and crevice test results.
* Claims proven by independent third party IBR (US) test results, EN1822 filter testing @ 0.1µ.
* ASTM F1977-04 testing performed by an independent lab.
* Based on ASTM F1977-04 test standard. Testing performed by an independent lab , under prescribed test conditions.
* Fine Particulate matter (PM2.5) in the United Kingdom, Quality Air Expert Group.
* Pollutants: Particulate matter (PM), United Nations Environment Programme http://www.unep.org/tnt-unep/toolkit/pollutants/facts.html