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FAQs about IEQc2 :

Does each individual zone need a 30% increase in ventilation, or can a weighted average be used for the building?

Do spaces which are not regularly occupied require increased ventilation?

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NC-2009 IEQc2:Increased Ventilation

30% for all spaces individually or for the total ?

We have an overall 30% ventilation above ASHRAE, but it is different in each spaces. Some spaces have 10% more and other have over 40% more. For credit compliance do we need 30% on the total ventilation, or do we need to have 30% for each individual zone?

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Dylan Connelly
Mechanical Engineer
Integral Group
LEEDuser Expert
342 thumbs up

Fri, 12/02/2011 - 18:33

Every space needs 30% over
Profile picture for user dconnelly
Dylan Connelly
Mechanical Engineer
Integral Group
LEEDuser Expert
342 thumbs up

Tue, 04/10/2012 - 20:43

FYI - This has been updated with the latest forms. Now you are able to enter just the total OSA for a system. This allows you to share OSA throughout the zones associated with each system. However, you still need to be aware of your zone Zp (ratio of OSA to Minimum Supply Air in a zone) as it can significantly raise your OSA requirements for a system.

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