We are working with a "Dayroom" space that has the following requirements: 4 ACH of Outdoor Air and 4 ACH of Total Air. The other spaces supplied by the Air Handling Unit do not require 100% outdoor air. As a result, we have designed the AHU that provides enough Outdoor Air for all spaces but not enough to provide 100% outdoor air to the Dayroom, instead supplying 80% outdoor air to the Dayroom.
In the LEED Minimum IAQ Performance Calculator, on the Summary Tab, we exceed the "Outdoor air intake flow exceeds Vot" but we do NOT pass the "Zone outdoor airflow provided meets Voz for all zones". Does GBCI/USGBC require that both Total and Zone outdoor airflow requirements are met to pass the pre-requisite?
Afogreen Build
www.afogreenbuild.comGreen Building Consultant
208 thumbs up
August 24, 2021 - 7:33 pm
Hi Justin,
Yes, "Outdoor air intake flow exceeds Vot" and "Zone outdoor airflow provided meets Voz for all zones" need to show the result of "YES" in the Summary tab.
LEED BD+C v4 guide page 611 also states "If the ventilation calculations in Step 2 indicate that the preliminary design does not provide enough outdoor air to meet the selected reference standard, revise the design and recalculate the minimum amount of outdoor air to confirm compliance. For single-zone and 100% outdoor air systems, increase the amount of outdoor air supplied by the system."
Devendra Chaughule
Senior Manager - Sustainable ServicesSurmount
29 thumbs up
August 25, 2021 - 2:07 am
What if "Zone outdoor airflow provided meets or exceeds Voz for all zones" indicating 'n/a'?
I hope this is applicable only for 100% outdoor air systems.
Afogreen Build
www.afogreenbuild.comGreen Building Consultant
208 thumbs up
October 18, 2021 - 12:31 am
Hi Devendra,
Yes, the "Zone outdoor airflow provided meets or exceeds Voz for all zones" is only available for 100% outdoor air systems. For single zone systems and multiple zone systems, the required result of "YES" in the Summary tab is only for "Outdoor air intake flow exceeds Vot".