Forum discussion
NC-2009 IEQp1: Minimum IAQ Performance
According to the IEQ space matrix bathrooms and storage rooms are excluded from VRP calculations for IEQp1, would they still be excluded from 100% OA systems?
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Is outdoor air quality testing required in a space using natural ventilation?
What options are available to projects outside the US to meet this prerequisite?
Can LEED 2009 projects elect to follow ASHRAE 62.1-2010 for this prerequisite?
Which units should be included in the calculations for this prerequisite?
Andrew Mitchell, P.E.
PrincipalMitchell Gulledge Engineering, Inc.
LEEDuser Expert
126 thumbs up
June 13, 2014 - 8:05 am
You will have to comply with either natural ventilation or required exhaust rates regardless of your system type.
Julia Weatherby
PresidentWeatherby Design & Co. Engineers
94 thumbs up
June 13, 2014 - 8:38 am
While what Andrew says is true, unoccupied storage rooms do not require outdoor air and may not require exhaust depending on whether chemicals, etc. are to be stored in the closet. Also in my experience, even though the exhaust is required in restrooms by ASHRAE 62.1-2007, you normally don't have to include any reference to restroom exhaust in your IEQp1 ventilation calculations.
The same spaces that are excluded from VRP calculation requirements are also excluded from 100% outdoor air system tabulations, yes.
Nelina Loiselle
Above Green239 thumbs up
June 13, 2014 - 3:13 pm
Julie, thank you for your clarifications! We will remove the storage and bathrooms from our 100%OA system tabulation.
Rudolph Carneiro
HVAC consultantOptimized Systems
26 thumbs up
August 8, 2014 - 9:49 am
Nena, dont forgot that exaust requirements in 62.1-2007 depend on wether it is or isnt an ocupiable space. Look up the definition of occupiable space in the 62.1 definitions section.