62.1 vs 170

Seems logical that you could use 170 as an ACP to 62.1. Might want to submit an inquiry, now, and confirm.

Are there any updates regarding this? If you submitted 170 as an ACP, was it successful? Does 170 then become the baseline for Increased Ventilation under Enhanced IAQ Strategies Option 2?

Dianne or Teresa - Did either of you ever get a resolution or guidance on substituting ASHRAE 170 for 62.1 when 62.1 doesn't address your space type?

Hi Michelle, we recently ran into this exact issue.  We were told the following by Megan Snyder at GBCI:

Projects are held to the requirements of the rating system adaptation under which the project is registered, so this project would not be required to demonstrate compliance with ASHRAE standard 170-2008. That said, ASHRAE Standard 170-2008 may be used in lieu of ASHRAE 62.1-2010 to demonstrate compliance with IEQp Minimum IAQ Performance for healthcare spaces. The project team may use the Appendix 1 calculator in the older version of the LEED v2009 IEQp1 form, which incorporates space types from both ASHRAE 170 and ASHRAE 62.1, to document compliance with the prerequisite: http://s3.amazonaws.com/ao-leedonline-prd/documents/usgbc/leed/content/CreditFormsDownload/V04/hc/ieq/ieqp1/ieqp1_dya.pdf.

Alternatively, for the spaces that are regulated by ASHRAE 170, you can submit an air balance summary (or room by room airflow summary) table to demonstrate that the minimum OA changes, min total air changes, and space pressurization relationships provided are consistent with that of Table 7-1 of the ASHRAE Standard 170-2008. There isn't a specific calculator or format for which this must be presented, and it can be the same calculations that are required by local code. If you have a copy of ASHRAE's HVAC Design Manual for Hospitals and Clinics, Table 3-1 provides an example of this calculation that would be acceptable for the purposes of LEEDv4. This is expected to be the typical approach followed by most teams that require identical/very similar calculations for local code requirements.

For cases where an ventilation system serves both ASHRAE 62.1 and ASHRAE 170 regulated space types, there are several hybrid approaches that can be used, which would be a little complicated to address in detail via email. We'd be happy to evaluate any proposed approaches and/or have a conference call to discuss this topic further if you would find that beneficial.
 

I had trouble finding that sample template even with the link, so if you need it I can email it to you directly.

Nancy Henderson

Thanks so much, Nancy - this is exactly what I was looking for!