IEQp1 form v06 has a new requirement to describe "how critical zones are selected and how all occupiable zones are accounted for in the determination of the critical zone. A critical zone is defined as the zone which requires the largest fraction of outdoor air in the primary air stream."
Is this mandatory for 100% outside air systems or only for VAV systems? In addition, there is little reference to critical zones in 62.1-2007 standard. Thanks in advance.
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Dionisio Franca
DirectorWoonerf Inc.
30 thumbs up
November 1, 2016 - 8:49 pm
Hi Charalampos,
The new calculator from USGBC is good to help understanding the different types of zone systems:
http://www.usgbc.org/resources/minimum-indoor-air-quality-performance-ca...
There are multiple zones, 100% OA, and single zones. Only multiple zones will require you to determine the critical zone. If you input all zones on a multiple zone calculator, the calculator will automatically look for the critical zone.
You can find an example of how to find the critical zone in the 62.1 user's manual: Example 6-M—Finding Critical Zones in Multiple Zone Recirculating Systems . . . . . . . . . . . 6-26
I recommend you get one. It is very helpful.