The document presents a discussion on the efficacy of HEPA-filtered devices, highlighting issues related to containment and safety in healthcare settings. It addresses the need for consistent testing methods, awareness of device performance, and interim solutions while manufacturers respond to existing concerns. The authors emphasize the importance of protecting vulnerable populations and the increased sensitivity within healthcare environments.

1. Testing HEPA-filtered Devices: NAMs, Scrubbers and Vacuums Milwaukee Chapter of the IAQA West Allis, Wisconsin April 23, 2009 Presented by: Wane A. Baker, P.E., CIH IAQ Division Manager Michaels Engineering Inc. Email: wab@MichaelsEngineering.com 608/785-1900 Slaskdfj lasjdfdf Presented by: Kent J. Rawhouser, CMRS, WLS President A&J Specialty Services, Inc. Email: [email_address] 608/846-9525

2. What’s the problem? Containment, pressure differentials Why should I care? Meeting “clearance” criteria Safety of those in adjoining areas, esp. healthcare What’s the solution? Increase awareness Require validation of performance IESO Standard under development “ PHEAF” devices

3. Definition of HEPA Consistent method of testing Why don’t these devices perform? What are the manufacturers doing about this problem? What should we do in the interim?

4. HEPA: high-efficiency particulate air Developed >50 years ago for control of radioactive particles during the Manhattan project Definition: 99.97% at 0.3 µm Institute of Environmental Sciences (IES) definition: "a throw-away extended-media dry-type filter in a rigid frame, having minimum particle-collection efficiency of 99.97% for 0.3 µm thermally-generated dioctyl phthalate (DOP) particles … and a maximum clean-filter pressure drop of ... 1.0 in w.g. when tested at rated air flow capacity."

5. Consistent method of testing Development of affordable laser particle counters Create well-mixed conditions To negate absolute error, use same particle counter on inlet and outlet Use 0.3 um channel only? Differential or cumulative mode?

6. Why don’t these devices perform? Inadequate filter rack seals, clamping devices/mechanisms Some cannot be cleaned downstream of filter rack! “ Rode hard and put up wet”

7. What are the manufacturers doing about this problem? “ What problem?” They’re listening – that’s a start Sounds like a business opportunity to me

8. What should we do in the interim? You’ve taken the first step If discharging to outdoors, less of an issue If working only with immunocompetent persons, less of an issue Even in these circumstances, if you’re having trouble knocking down bioaerosol (or asbestos or lead) levels, this may be why……

9. What should we do in the interim? If working in healthcare, you must protect yourself Immunocompromised fraction of our population is on the rise Health information privacy Rise in HIV/AIDS Segment of population with sensitivities is also increasing

26. “ Real Professionals. Real Solutions.” Wane A. Baker, P.E., CIH Michaels Engineering Inc. St. Paul, La Crosse, Milwaukee, Green Bay 608/785-1900 Email: [email_address] Website: www.MichaelsEngineering.com Kent J. Rawhouser, CMRS, WLS A&J Specialty Services Inc. 608/846-9525 Email: kent@aandjss.com Website: www.aandjss.com Thank you!