Medical space types not listed in the Minimum IAQ Performance Calculator

Your combined ASHRAE 170 and 62.1 calcs must be provided for Min IAQ on LEED HC projects.  There is not a LEED calculator that includes ASHRAE 170 space types and requirements, so the one used by the design firm is typically submitted.  You just need to make sure it is as clear as the 62.1 they provide.

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Cory!   Our ventilation requirement for all clinical spaces is ASHRAE 170 which is based on Outdoor air ACH and total airflow ACH, and not occupant or SF based as ASHRAE 62 is.  ASHRAE 62 does reference ASHRAE 170 for Clinical healthcare vent rates.The LEED VPR calculator does not seem to have the ability to input ACH as a requirement.  Is their guidance on LEED vent calcs for a healthcare facility?   You mentioned it being as clear as the 62.1 they provide, but with it based on OA ACH, what do we show?

Hi!Provide your spreadsheet calculations showing the minimum required ventilation based on the OA ACH and minimum total ACH.  Provide clear calculations for each space to show how the minimum ventilation based on the ASHRAE 170 min OA is calculated, and then how that sums up to calculate the minimum required CFM per AHU.  There was an ASHRAE Journal cover article a year or so ago on how to do combined ASHRAE 62.1 and 170 ventilation calculations.  The gist is you calculate for each AHU how much OA is required for the 170 spaces and do the 62.1 mz calculation including the Ev for the 62.1 spaces.  Then the resulting sum is how much OA is required for that AHU.