1. NAFA Technical Seminar April 19, 2012 ANSI/ASHRAE 52.2 Can we fix this Method of Test?

2. History of the Test procedure 10+ years in development prior to 1999 release Task of 52.2 Committee "create a test method based on particle size removal efficiency for end user evaluation of filter performance" Research projects led to greater understanding of the physical science in filtration MERV - scales were created with minimal data and educated guesses at value spread

4. Committee Efforts Std published in 1999 for the first usage No revisions through 2007 (other than edits) 2008 Arrestance and DHC were added from 52.1 predominantly for MERVs 1-4 52.1 was removed from ASHRAE Standards Addition of "Voluntary Conditioning Step"

5. MERV's Status? ASHRAE Rating system? No certification of personnel performing tests No policing entity to produce a rating system

7. ISO Standards Working groups creating standards for Cleanroom and HEPA usage completed UVC, Rotating Equipment, dust collection Working group 3 - General HVAC filtration is looking to use 52.2 MOT for developing PM efficiency values