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Search Articles The Role of Filtration with Building Security in the Post 9/11 World: Is Filtration the “Silver Bullet?” June 29, 2011 “9/11” CHANGED THE WORLD. The early reactions to the events surrounding and following 9/11 were similar to the “Chicken Little” of nursery rhyme folklore fame. As with “The sky is falling!” shouts of…

Search Articles How Many Types of HEPA Filters Are There? June 29, 2011 According to the Institute of Environmental Science and Technology, (IEST) with regard to performance, there are 6 types – A, B, C, D, E & F. Each has its own distinct characteristics as shown by chart 1 below. * Test on encapsulated…

Search Articles Review of Eurovent 4/10 – 1996 June 29, 2011 In Situ Determination of Fractional Efficiency in General Ventilation Filters The purpose of the EN 4/10 research paper was what many of us in the industry of air filtration have looked for as a method of validating the performance of one filter system to…

Search Articles Clear on Clearance June 29, 2011 According to Encarta – World English Dictionary, “clearance” is defined as “removal of unwanted objects” and “permission for something to happen.” Both definitions are pertinent to the subject of remediation of compromised indoor environments. Additionally, definition of another term, “remediation,” should be considered. The term is defined…

Search Articles MERV Filter Models June 29, 2011 For Aerobiological Applications Air Media article published Summer 2002. by W.J. Kowalski, PE, Ph.D. and William Bahnfleth, PE, Ph.D., The Pennsyvania State University Technical input also provided by Charlie Seyffer, Camfil and Keith Chesson of Airguard. Recent concerns about bioterrorism and existing concerns about indoor air quality have…

Search Articles Residential Air Filtration June 28, 2011 When to Change Your Air Filter? When it is loaded with dust, of course. But, unfortunately, there is more to the story than this simple statement. First, a short lesson on media air filters. All filters, be they commercial or residential, battle the same three forces of…

NAFA Position Statement on Bio-terrorism Search Articles June 28, 2011 Using ANSI Standard 52.2 in preparedness in bio-terrorism The National Air Filtration Association (NAFA) recognizes the increased concern about dangerous airborne diseases and further understands that as an association of air filtration professionals, it has an obligation to present a position statement with respect to…

Search Articles NAFA Position Statement on Ozone June 28, 2011 Because NAFA supports the position stated by the Environmental Protection Agency, that “…Ozone can be harmful to health,” NAFA opposes the use of ozone producing equipment used as air cleaners or air purifiers in occupied spaces. Therefore, NAFA adopts the position that ozone air cleaner manufacturers…

Search Articles The Importance of Air Filtration June 28, 2011 Air filtration supplies the means to obtain the level of particulate cleanliness required by any definition of “air conditioning.” It extends from the simple task of preventing lint and other debris from plugging heating/cooling coils to removing particles as small as 0.1 micron which could…

Search Articles Recent Advances in Particulate Air Filter Testing: Quality Assurance Framework June 28, 2011 In the last ten years, there has been increased interest in health related aspects of indoor air quality. The application of general ventilation air cleaners and filters has subtly changed from the protection of equipment and prevention of soiling, to…