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outside air changes per hour flow to that Proposed Subject Summary/Details space.” The intent of these requirements Addendum is to encourage the use of a central airProvides Clarifications Regarding: Filtration and handling system for conditioning of out• All Air Supplied Shall Be Filtered h Recirculating side air, whenever recirculating room Room HVAC Units • Definition of Recirculating Room HVAC Units HVAC units are used, and to ensure that Table 6-1 Minimum Filter Efficiencies: all air (primary or recirculated) is fil• A Second Bank of Filters is Proposed for Nursing Nursing/ tered appropriately. Facilities j Residential Residential health care facility filHealth Facilities • Filters are Proposed for Hospice and Assisted tration. The primary focus of AddenLiving Facilities. dum j is to update filtration requirements for several residential health care occu- Table 3: Addenda in publication public review process. pancies, which were previously included in the 2006 Guidelines. For central air-handling systems, a sec- also permits the FGI Guidelines to be updated between the ond filter bank (MERV 13) is required for certain resident areas four-year revision cycles. This standard is continuing to imin nursing facilities (including skilled nursing), and a first filter prove due to active interest by the membership of ASHRAE, bank (MERV 7) is required for hospice and assisted living fa- FGI Health Guidelines Revision Committee (HGRC) memcilities. This update maintains the two bank requirements of the bers, the membership of the American Society for Healthcare 2006 Guidelines for nursing facilities, and eliminates the 2006 Engineering (ASHE), and the public at large. Guidelines requirement for the second filter bank in hospice and assisted living facilities. Author Note Chilled beams. The committee has spent considerable time At the ASHRAE Winter Conference in Las Vegas, January over the past year deliberating on the application of chilled 2011, use of the multiple zone system calculations of Standard beams in health care settings. The committee continues to dis- 62.1 was reconsidered; and its applicability was supported by cuss condensation prevention, maintenance, and field testing the committee and a future addendum will be issued for public of chilled beam systems. review and comment. Multiple spaces provisions (multiple zone systems). A proposal was considered by the committee to apply the proce- References 1. Facilities Guidelines Institute. 2010. Guidelines for Design and dure described in ASHRAE Standard 62.1 for multiple-zone Construction of Health Care Facilities. American Society of Healthsystems for determining the amount of outside air to be supcare Engineering. plied in health care occupancies. After careful deliberation, the 2. AIA. 2006. Guidelines for Design and Construction of Health committee rejected this proposal due to the basic differences Care Facilities. American Institute of Architects. in why the outside air is needed. For the purposes of Stan3. Tang, et al. 2006. “Factors involved in the aerosol transmission dard 62.1, outside air is needed for general dilution of indoor of infection and control of ventilation in healthcare premises.” Journal contaminants. Standard 170, on the other hand, is significantly of Hospital Infection 64:100 – 114. 4. Lowen, et al. 2007. “Influenza virus transmission is dependent on concerned also with infection control. The committee is conrelative humidity and temperature.” PLOS Pathogens 3(10). tinuing to analyze the potential for the applicability of the pro5. Shaman, K. “Absolute humidity modulates influenza survival, cedure for multiple-zone systems in health care occupancies. transmission, and seasonality.” Proceedings of the National Academy

Future Issues
In addition to the items mentioned here, the committee has other issues to consider such as energy recovery, ducted return air systems, reserve capacity for domestic hot water, location and quantity of operating room return air grilles, emergency department requirements, differential pressure for bronchoscopy rooms, and acoustic and vibration control issues. In addition to these items, the committee intends to spend additional time reviewing outpatient and residential health care facility requirements. The results of these efforts will be seen in future addenda.

of Sciences. www.pnas.org/cgi/doi/10.1073/pnas.0806852106. 6. Centers for Disease Control and Prevention (CDC) and Healthcare Infection Control Practices Advisory Committee (HICPAC). 2003. “Guideline for environmental infection control for health-care facilities.” www.cdc.gov/hicpac/pdf/guidelines/eic_in_HCF_03.pdf. 7. Healthcare Ventilation Research Collaborative. 2009. “Displacement Ventilation Research – Phase II Summary Report.” 8. Bartley, J., L.K. Archibald, F. Memarzadeh, R. Conner. 2010. ASHE/FGI Workshop. “The Role of Humidity in Operating Rooms— Demystifying the Myth.” http://tinyurl.com/4pnkxtj.

Bibliography
1. Bartley J.M., R.N.O. Olmsted, J. Haas. 2010. “Current views of health care design and construction: Practical implications for safer, cleaner environments.” Am J Infect Control 38:S1–12. http://tinyurl.com/66nhsf9. 2. Ninomura, P., R. Hermans. 2008. “Ventilation standard for health care facilities.” ASHRAE Journal (50)10. 3. Ninomura, P., et al. 2006. “Updated guidelines for design and construction of hospital and health care facilities.” ASHRAE Journal (48)6:H33. ashrae.org March 2011

Summary
Standard 170 has benefited from the ASHRAE process of continuous maintenance. The published addenda and proposed addenda are the result of committee member initiatives, proposed changes, and requests for interpretations. This process
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ASHRAE Journal - March 2011

Table of Contents for the Digital Edition of ASHRAE Journal - March 2011